Ask a vet online – ‘my dog only has one testicle down – what is the best age to have him neutered?’

Question from Pam Gilmour

Hi my chi(huahua) is 6 months , he only has one testicle. I will be having him done, what would be the best age to wait to see if it will come down?

Answer from Shanika (online vet)

Hi Pam and thank you for your Question regarding the best age to have a dog castrated which has a retained testicle.

I will start by explaining a little about the testicles, what they are, where they develop and what can go wrong along the way.

The testicles are two oval shaped structures normally found in the scrotum (loose sac of skin near your dog’s bottom). Testicles are male sexual glands and produce the hormone testosterone along with sperm and various other secretions which assist in reproduction.

The testicles start developing while the puppy is inside the mother’s uterus (womb); they are at first located inside the abdomen (tummy) and just behind the kidneys. A few days after your puppy has been born the testicles should be in the scrotum, they travel from their starting point down through the abdomen and through an opening called the inguinal ring in order to get to the scrotum.

When you take your puppy to the vets to have his first examination they will check for the presence of two testicles in the scrotum, if these cannot be felt then this will be checked again on future visits.  If both testicles are not present this condition is referred to as cryptorchidism (retained testicles), either one (unilateral cryptorchid) or both (bilateral cryptorchid) of the testicles may be missing from the scrotum.  In very rare cases on or both of the testicles has not actually developed at all.

What should you do if your dog has cryptorchidism?

Your vet is likely to suggest that you wait to see if the missing testicle comes down into the scrotum at a later date, this would usually be by 6 months of age but in some cases can occur up to 1 year of age.

What to do if the testicle does not appear?

Your vet will discuss a castration procedure with you in which both testicles are removed, it is a simple procedure to remove under general anaesthesia the testicle present in the scrotum, the retained one has to be located in your dog’s abdomen, and this can take some time. The surgical procedure to find and remove the testicle from the abdomen can be tricky as the testicle which has not found its way to the scrotum is often smaller and therefore not so easy to locate in amongst the contents of your dog’s abdomen.

Why should I have my dog castrated if he has cryptorchidism?

If the testicles are not in their correct location in the scrotum there is an increased chance of them becoming diseased, such as developing into cancerous tissue. Also a dog with cryptorchidism is likely to have reduced fertility and would not be an ideal candidate for breeding.

I hope that I have managed to answer your question regarding the timing of castration in a cryptorchid dog and have managed to explain some of the reasoning behind why it happens and what the best plan of treatment is.

Shanika Winters MRCVS(online vet)

If you are worried about your dog please book an appointment with your vet or use our online symptom checker.

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206 thoughts on “Ask a vet online – ‘my dog only has one testicle down – what is the best age to have him neutered?’

  1. I have a 4yr. old Chihuahua that has an undescended testicle. I am so afraid of having this surgery on him. He is like my baby. Because I’m not able to prepare him for this, assure him I will be back for him and he will be ok. How long does the pet usually have to stay in a cage before the surgery? He’s never been in a cage. Is there a medicine to give him to help him relax before we get to the vet for surgery.

    Thank you!

    1. Tami – Definitely speak to your vets, the team will be able to answer all your questions and reassure you… they may even show you where he will be while recovering.

  2. I have a 4yr. old Chihuahua that has an undescended testicle. I am so afraid of having this surgery on him. He is like my baby. Because I’m not able to prepare him for this, assure him I will be back for him and he will be ok. How long does the pet usually have to stay in a cage before the surgery? He’s never been in a cage. Is there a medicine to give him to help him relax before we get to the vet for surgery.

    Thank you!

    1. Tami – Definitely speak to your vets, the team will be able to answer all your questions and reassure you… they may even show you where he will be while recovering.

  3. hello mt vet castrated my dog today, and we only did away with one teatacle just cause he found only one, hope there won’t be any side effect? cos am not feeling comfortable ever since thanks.

  4. hello mt vet castrated my dog today, and we only did away with one teatacle just cause he found only one, hope there won’t be any side effect? cos am not feeling comfortable ever since thanks.

  5. HI. Could you please tell me if my puppy now 15 weeks
    with not testicles descended can be operated on like a human to bring them down? My vet said at 10 weeks
    that one was down and he could feel the other one,. However on a visit last week none could be felt and it was like they had gone back up. Is this possible? My vet was perplexed and said he had never known any go back up.
    thankyou,

    1. I had my 6 month old chawawa to vet to have nutered and only 1 was down. I was advised that it cpuld still come down in next few months to wait and give it time. My vet does not like to fix my animals till they r at least 6 months old . That hives thier bodirs time for things to move sometimes it can take up to a year for both to dtop. Hope this helps

  6. HI. Could you please tell me if my puppy now 15 weeks
    with not testicles descended can be operated on like a human to bring them down? My vet said at 10 weeks
    that one was down and he could feel the other one,. However on a visit last week none could be felt and it was like they had gone back up. Is this possible? My vet was perplexed and said he had never known any go back up.
    thankyou,

  7. My dog was castrated today but only one testical was found despite searching in his abdomen. The vet said he now needs an injection every day for life, why and is it really necessary?

    1. Hi, there has been trials of dogs having hormone injections, but the evidence of how much it is effective is often disputed. We suggest having a good chat with your vet and discussing the options available – if there is anything you are not happy with or don’t understand, then ask them to explain further.

  8. My dog was castrated today but only one testical was found despite searching in his abdomen. The vet said he now needs an injection every day for life, why and is it really necessary?

    1. Hi, there has been trials of dogs having hormone injections, but the evidence of how much it is effective is often disputed. We suggest having a good chat with your vet and discussing the options available – if there is anything you are not happy with or don’t understand, then ask them to explain further.

  9. My vet gave the hormone injections over a 10 day
    period at a cost of over £100 which did no good whatsoever.
    Another person said that the testicles could be dragged
    down and stitched in place. Has anyone any knowledge
    of this procedure?

  10. My vet gave the hormone injections over a 10 day
    period at a cost of over £100 which did no good whatsoever.
    Another person said that the testicles could be dragged
    down and stitched in place. Has anyone any knowledge
    of this procedure?

    1. Hi, my chihuahua boy dropped his when he was 14mnths old after vet said no, dont know if it really did the trick or natural but i used boy special for a month at 12 mnths old and a couple of mnths later down it came and is now the same size as twin.

      1. Chihuahuas once again not reading the text-books! It does happen occasionally, but it’s not something to bank on…

        1. St Bernards and other large breed dogs take a lot longer to reach their full growth, and puberty is often later as well. I’d get him checked out when he reaches 6 months, there’s every chance he’ll be starting to grow up a bit by then!

  11. Hello Doctor ,

    our dog is 8yrs old he has cryptorchidism since birth but our doctor say we operate him after 7 yrs … now age of 8th his testicles become big in body noe doctor say we operate …is it safe plz reply

    1. Hi, all operations, no matter what they are, carry some amount of risk – so to say it is safe would be unfair of us. We’d advise speaking fully to your vet and telling them your concerns – we are sure they will be able to put your mind at rest.

  12. Hello Doctor ,

    our dog is 8yrs old he has cryptorchidism since birth but our doctor say we operate him after 7 yrs … now age of 8th his testicles become big in body noe doctor say we operate …is it safe plz reply

    1. Hi, all operations, no matter what they are, carry some amount of risk – so to say it is safe would be unfair of us. We’d advise speaking fully to your vet and telling them your concerns – we are sure they will be able to put your mind at rest.

    1. Hi my Puppy only has one testicle. He is a 7 month old Pit Bull. Once he gets older I wanted to breed him. Do you think the testicle can still drop or is he in danger. I am very worried about him. Breeding him is not important, his health is. Thank you.

      1. Hi Ginger. Try not to worry – pop him along to your vet for a check-up and they’ll be able to examine him and give you an idea as to whether they think it’ll still drop or not. If they don’t think it will, they’ll probably advise castration to avoid any risks further down the line.

  13. I had my dog neutered 3 years ago at age 8. His sac was left but now it looks like he has another testical in there when before it looked like a deflated balloon. Its not hard. It feels like he has fluid in it. What could this be. Please and thank you!

  14. I had my dog neutered 3 years ago at age 8. His sac was left but now it looks like he has another testical in there when before it looked like a deflated balloon. Its not hard. It feels like he has fluid in it. What could this be. Please and thank you!

  15. Hi,
    My 9 month old maltese shih-tzu has still only dropped one testical, what are the chances that the other remaining in his abdomen could turn cancerous and if I have him neutered, at what age would be best ?
    Thanks
    Geoff

    1. Hi Geoff, the advice we would give is to speak to your vet again with your concerns – they are best placed to examine and advise about neutering as many vets are different. With regards whether the remaining one would turn cancerous, its almost impossible to say, again your own vet should be able to give your their best advice.

  16. Hi,
    My 9 month old maltese shih-tzu has still only dropped one testical, what are the chances that the other remaining in his abdomen could turn cancerous and if I have him neutered, at what age would be best ?
    Thanks
    Geoff

    1. Hi Geoff, the advice we would give is to speak to your vet again with your concerns – they are best placed to examine and advise about neutering as many vets are different. With regards whether the remaining one would turn cancerous, its almost impossible to say, again your own vet should be able to give your their best advice.

  17. Hello,

    I’ve a 5yr old Lab and he has 1 testicle. I’ve been noticing for about 3-4 days now that his 1 visible testicle has some what swollen.

    I remember almost 2yrs ago, he mentioned that we should go for castration but like all pet lovers, I am really scared him. It actually pains to even think about the whole deal. But I know this will all be for his better health.

    Is there some advice or opinions the whole swollen testicle and castration?

    Thank you for your time.

    Regards,
    Paul

  18. Hello,

    I’ve a 5yr old Lab and he has 1 testicle. I’ve been noticing for about 3-4 days now that his 1 visible testicle has some what swollen.

    I remember almost 2yrs ago, he mentioned that we should go for castration but like all pet lovers, I am really scared him. It actually pains to even think about the whole deal. But I know this will all be for his better health.

    Is there some advice or opinions the whole swollen testicle and castration?

    Thank you for your time.

    Regards,
    Paul

  19. Hello, I have a black pug and he is 1 year and 4 months. He has 1 ball (other never fell and could.never be felt) and he marks EVERYTHING…we have been looking at getting him neutered but to find the other one is a little pricy. Do you know if it is possible to do the chemical neutering or should it be done on both? Also, do you think it would help with his marking?

  20. Hello, I have a black pug and he is 1 year and 4 months. He has 1 ball (other never fell and could.never be felt) and he marks EVERYTHING…we have been looking at getting him neutered but to find the other one is a little pricy. Do you know if it is possible to do the chemical neutering or should it be done on both? Also, do you think it would help with his marking?

  21. My nephew gave me his toy poodle & the poodle only has one testicle that dropped & he’s 13 yrs old, when I took him to vet they had said that he’s too old for surgery, now his resticle is hugh. He doesn’t cry or act different like if it bothers him or in any pain. What will happen? Will he survive a surgery & is that surgery expensive? Is it cancer?

    1. Hi, we strongly suggest you go back to your vet and discuss your concerns with them. The questions you have asked are impossible to answer and they are best placed to answer, given the medical history and examination.

  22. My nephew gave me his toy poodle & the poodle only has one testicle that dropped & he’s 13 yrs old, when I took him to vet they had said that he’s too old for surgery, now his resticle is hugh. He doesn’t cry or act different like if it bothers him or in any pain. What will happen? Will he survive a surgery & is that surgery expensive? Is it cancer?

    1. Hi, we strongly suggest you go back to your vet and discuss your concerns with them. The questions you have asked are impossible to answer and they are best placed to answer, given the medical history and examination.

  23. Hi
    Why do you need to remove both teaticles in a dog who has unilateral undescended testicle?
    Why can’t you keep the good testicle?
    Thanks

  24. Hi
    Why do you need to remove both teaticles in a dog who has unilateral undescended testicle?
    Why can’t you keep the good testicle?
    Thanks

  25. Hi , I have a seven month old American akita , one of his testicles has never came down and recently within the past few weeks he’s started limping we took him vets and bought some antibiotics( was told he has banged his knee so we gave them to him, but this hasnt helped we are going to get him castrated , is this a common symptom because I can’t see anything stuck in his paw , just not sure weather to rush the operation on he’s booked in for two weeks time but hate seeing him limping x

  26. Hi , I have a seven month old American akita , one of his testicles has never came down and recently within the past few weeks he’s started limping we took him vets and bought some antibiotics( was told he has banged his knee so we gave them to him, but this hasnt helped we are going to get him castrated , is this a common symptom because I can’t see anything stuck in his paw , just not sure weather to rush the operation on he’s booked in for two weeks time but hate seeing him limping x

  27. i have a husky malmute he is 13months and only got one tesicle i dont know what to do will he need a opartion because off this it does not Bother him at the moment just curious about it thankyou

    1. It is possible, the best thing would be to consult your own vet for their advice – they are best placed to give you the options for you dog.

  28. i have a husky malmute he is 13months and only got one tesicle i dont know what to do will he need a opartion because off this it does not Bother him at the moment just curious about it thankyou

    1. It is possible, the best thing would be to consult your own vet for their advice – they are best placed to give you the options for you dog.

  29. My dog is 2 and a half years old. He has just one testicle. What procedure does he need to get before I can neuter?

    1. Hi Alma, the neutering procedure will be the same operation as locating the missing testicle. Your dog my have two wounds, in the normal place on the testicular sac and possible further up towards the abdomen – it is all according to where the vet can find the testicle that is hiding! Speak to your vet to find out more advice, but we hope that helps a bit. Dave RVN Vet Help Direct

  30. My dog is 2 and a half years old. He has just one testicle. What procedure does he need to get before I can neuter?

    1. Hi Alma, the neutering procedure will be the same operation as locating the missing testicle. Your dog my have two wounds, in the normal place on the testicular sac and possible further up towards the abdomen – it is all according to where the vet can find the testicle that is hiding! Speak to your vet to find out more advice, but we hope that helps a bit. Dave RVN Vet Help Direct

  31. My male chihuahua has only had one descended testicle since his first vet check. I’ve checked from time to time since his first exam with no change in the status. Yesterday I brought him in at 27 weeks (6 months) for an exam and to set up his neuter since 6 months seems to be the recommended age for this situation & the vet said he could feel it close to the ring, but definitely not descended. Well, today he has 2! Both have magically made their fashionably late appearance. From everything I’ve read, this is highly unusual. I do plan to call my vet in the morning, but in the meantime, I feel like “what just happened here?!?!” Is it possible he vet exam nudged them in the direction they needed to go? I’ve been checking the whole time, guess I just didn’t have the right touch??? I also fear that the late bloomer will find its way back to wherever it was hidden??? I’m almost afraid to get to excited!

  32. My male chihuahua has only had one descended testicle since his first vet check. I’ve checked from time to time since his first exam with no change in the status. Yesterday I brought him in at 27 weeks (6 months) for an exam and to set up his neuter since 6 months seems to be the recommended age for this situation & the vet said he could feel it close to the ring, but definitely not descended. Well, today he has 2! Both have magically made their fashionably late appearance. From everything I’ve read, this is highly unusual. I do plan to call my vet in the morning, but in the meantime, I feel like “what just happened here?!?!” Is it possible he vet exam nudged them in the direction they needed to go? I’ve been checking the whole time, guess I just didn’t have the right touch??? I also fear that the late bloomer will find its way back to wherever it was hidden??? I’m almost afraid to get to excited!

  33. hi my dog has only one testicle but i want to wait to neutered him at 2 years old he is 1 year old know can i wait ?

    1. It shouldn’t be a problem at all, but always confer with your own vet, as they will be able to discuss the options with you.

  34. hi my dog has only one testicle but i want to wait to neutered him at 2 years old he is 1 year old know can i wait ?

    1. It shouldn’t be a problem at all, but always confer with your own vet, as they will be able to discuss the options with you.

  35. Hi there! Thank you for your answers about cryptorchid dogs. Our 7 month old sheltie puppy is a unilateral cryptorchid. We’d like to wait until he’s 12 months old before surgery, in the unlikely case that the second testical drops. In the meantime, I’ve read that the testosterone level can be higher because the undescended testical is warmer internally and therefore produces more testosterone. Is this true?
    Our pup is very sweet and not aggressive with humans but has taken to humping our 8 year old collie constantly. She’s not too happy with that form of attention. Is there anyway to lessen his testosterone level with medication prior to neutering?
    Secondly,is it possible to locate the undescended testical using perhaps ultrasound just prior to the surgery? It seems like that would be safer than searching around during the procedure.

    1. Hi Susan, there are certain drugs that can be short term ‘chemical castration’, please speak to your vet to see if they administer these (normally an injection). Some vets may have a technique for locating undescended testicles using a variety of methods, again speaking to your own vet might shed some more light on it.

  36. Hi there! Thank you for your answers about cryptorchid dogs. Our 7 month old sheltie puppy is a unilateral cryptorchid. We’d like to wait until he’s 12 months old before surgery, in the unlikely case that the second testical drops. In the meantime, I’ve read that the testosterone level can be higher because the undescended testical is warmer internally and therefore produces more testosterone. Is this true?
    Our pup is very sweet and not aggressive with humans but has taken to humping our 8 year old collie constantly. She’s not too happy with that form of attention. Is there anyway to lessen his testosterone level with medication prior to neutering?
    Secondly,is it possible to locate the undescended testical using perhaps ultrasound just prior to the surgery? It seems like that would be safer than searching around during the procedure.

    1. Hi Susan, there are certain drugs that can be short term ‘chemical castration’, please speak to your vet to see if they administer these (normally an injection). Some vets may have a technique for locating undescended testicles using a variety of methods, again speaking to your own vet might shed some more light on it.

  37. Hi! Please i need your advice regarding my 3 year old Yorkshire. My dog only has one testicle and i still havent had him operated. I am extremly scared. At what age can this problem turn into cancer?

    1. It is impossible to say, or even if it will turn cancerous. Please speak to you vet and express your concerns as they will know the dogs medical history.

  38. Hi! Please i need your advice regarding my 3 year old Yorkshire. My dog only has one testicle and i still havent had him operated. I am extremly scared. At what age can this problem turn into cancer?

    1. It is impossible to say, or even if it will turn cancerous. Please speak to you vet and express your concerns as they will know the dogs medical history.

  39. Hi my British bulldog is 6 month’s old and only one testicles down but if I have a good feel around him you can find the other one what can I do to bring it down .thanks

    1. Hi Thomas,

      There is not much you can do, but hope nature takes it’s course… sometimes both do descend it’s according to where they are located and how far up they are. Some owners try to help them down by manipulation, but its rarely successful.

  40. Hi my British bulldog is 6 month’s old and only one testicles down but if I have a good feel around him you can find the other one what can I do to bring it down .thanks

    1. Hi Thomas,

      There is not much you can do, but hope nature takes it’s course… sometimes both do descend it’s according to where they are located and how far up they are. Some owners try to help them down by manipulation, but its rarely successful.

    1. Hi Brina, hopefully all is well. This blog is UK based and is not monitored overnight. In cases such as yours we’ll always advise contacting your own veterinary professionals.

    1. Hi Brina, hopefully all is well. This blog is UK based and is not monitored overnight. In cases such as yours we’ll always advise contacting your own veterinary professionals.

  41. i have a dog which right now he is in a shelter because he escaped but we tried to get him out of the shelter but they told because we dont have the license of the dog we need to neuter him becuase he only has one testical but does it effect anything and do i need to

    1. Hi Vilma, I’m afraid we cannot comment on this case as it may be the policy in your part of the world. We are based in the UK, so have different rules and regulations. Please seek advice of your local veterinarian, as they would know more.

  42. i have a dog which right now he is in a shelter because he escaped but we tried to get him out of the shelter but they told because we dont have the license of the dog we need to neuter him becuase he only has one testical but does it effect anything and do i need to

    1. Hi Vilma, I’m afraid we cannot comment on this case as it may be the policy in your part of the world. We are based in the UK, so have different rules and regulations. Please seek advice of your local veterinarian, as they would know more.

  43. I’m thinking about buying a dog that is 16weeks old from a family friend. I’ve just been told the dog has only had one injections and has been going out. Is the dog in danger of getting an infection? What else should I be worried about? Thanks

    1. Hello Barry, although one injection will give some resistance to infections, it is important that you have a visit to your vet and get the puppy a full set of primary vaccinations. They will be able to give your dog a complete health check and advise of any other worries you may have.

  44. I’m thinking about buying a dog that is 16weeks old from a family friend. I’ve just been told the dog has only had one injections and has been going out. Is the dog in danger of getting an infection? What else should I be worried about? Thanks

    1. Hello Barry, although one injection will give some resistance to infections, it is important that you have a visit to your vet and get the puppy a full set of primary vaccinations. They will be able to give your dog a complete health check and advise of any other worries you may have.

  45. Hi my male chow chow pup who is almost 6 months old,has bilateral cryptorchidism,I think as I cannot see or feel his testicals,when I took my boy to the vets to get micro chipped,the vet asked if he had been castrated,I laughed as he was only 12wks old,the vet said,she couldn’t find his testicals and would need an operation,I am unsure ov what age is best for him to have this procedure done,and also the cost Any help or information would be gratefully appreciated. Many thanks for your time. Kind regards. Nicola

    1. Hi Nicola, in this case it is best to speak to your vet as each case is different. Ask them the best time they believe the operation would be and discuss costs as well.

  46. Hi my male chow chow pup who is almost 6 months old,has bilateral cryptorchidism,I think as I cannot see or feel his testicals,when I took my boy to the vets to get micro chipped,the vet asked if he had been castrated,I laughed as he was only 12wks old,the vet said,she couldn’t find his testicals and would need an operation,I am unsure ov what age is best for him to have this procedure done,and also the cost Any help or information would be gratefully appreciated. Many thanks for your time. Kind regards. Nicola

    1. Hi Nicola, in this case it is best to speak to your vet as each case is different. Ask them the best time they believe the operation would be and discuss costs as well.

    1. Hi Maggie, sometimes young dogs can have the ability to do this! Speak to your vet with your concerns and see what they suggest, most times the issue sorts itself!

    1. Hi Maggie, sometimes young dogs can have the ability to do this! Speak to your vet with your concerns and see what they suggest, most times the issue sorts itself!

  47. Hi, i have an 17 weeks old American bully. One of his testicle is on the scrotum and the other is not but, is in low position and when i push it little bit with gently movements it’s going on the scrotum but after is going back again. When he is seated then some times is visible on the scrotum or if i will pull his skin up on this place then the testicle is there. when he is standing on 4 legs then only 1 testicle is visible on the scrotum. What’s about this situation ? Does he has crypto or not? I don’t trust Vets here in the country that i leave now. Please let me know if he has crypto or not. Thanks !

    1. Hi Steve, dogs develop at their own pace and there is still time for both testicles to fall into the correct position. We would expect most dogs to have two descended testicles by the age of 6 months (your puppy is younger than this) and some may take longer, up until about 1 year of age. Keep an eye on the situation and try to find a vet that you trust so that they may examine your puppy and determine whether he is cryptorchid as it will be important for them to advise you on the best course of action if he is.

  48. Hi, i have an 17 weeks old American bully. One of his testicle is on the scrotum and the other is not but, is in low position and when i push it little bit with gently movements it’s going on the scrotum but after is going back again. When he is seated then some times is visible on the scrotum or if i will pull his skin up on this place then the testicle is there. when he is standing on 4 legs then only 1 testicle is visible on the scrotum. What’s about this situation ? Does he has crypto or not? I don’t trust Vets here in the country that i leave now. Please let me know if he has crypto or not. Thanks !

    1. Hi Steve, dogs develop at their own pace and there is still time for both testicles to fall into the correct position. We would expect most dogs to have two descended testicles by the age of 6 months (your puppy is younger than this) and some may take longer, up until about 1 year of age. Keep an eye on the situation and try to find a vet that you trust so that they may examine your puppy and determine whether he is cryptorchid as it will be important for them to advise you on the best course of action if he is.

  49. My five month old boxer puppy as one descended testicle and one very close to descending fully into scrotum. But on standing it’s not dropped.its sometimes there when sitting and sometimes when lying down on his back. I can pop it into scrotum very easily. Does this mean I have hope that the eguinal ring as closed and it will fully drop to stay ?

    1. Hi Jill, Some dogs don’t fully develop until the age of 1 year so at 5 months there’s still time for his second testicle to descend fully. I’d recommend having it checked by your vet periodically and they’ll be able to advise you on the best course of action should it not develop fully. Best wishes.

  50. My five month old boxer puppy as one descended testicle and one very close to descending fully into scrotum. But on standing it’s not dropped.its sometimes there when sitting and sometimes when lying down on his back. I can pop it into scrotum very easily. Does this mean I have hope that the eguinal ring as closed and it will fully drop to stay ?

    1. Hi Jill, Some dogs don’t fully develop until the age of 1 year so at 5 months there’s still time for his second testicle to descend fully. I’d recommend having it checked by your vet periodically and they’ll be able to advise you on the best course of action should it not develop fully. Best wishes.

  51. I have a ten week old French bulldog and he only has one ball in the sack,should I have him done,or should I let time deal with this,would be breeding him be out the picture.

    1. Hi Jake, your French bulldog is still very young, there is much time for the second testicle to develop. If it doesn’t however, and he remains cryptorchid, it is generally recommended that they are castrated and it’s not thought sensible to breed from such a dog. Have him regularly checked by your vet and discuss the best plan of action with them. Many thanks.

  52. I have a ten week old French bulldog and he only has one ball in the sack,should I have him done,or should I let time deal with this,would be breeding him be out the picture.

    1. Hi Jake, your French bulldog is still very young, there is much time for the second testicle to develop. If it doesn’t however, and he remains cryptorchid, it is generally recommended that they are castrated and it’s not thought sensible to breed from such a dog. Have him regularly checked by your vet and discuss the best plan of action with them. Many thanks.

  53. Hi, I have a 13 month old whippet × lurcher. Neither of his testicle’s dropped, so after many visits to our vet, she decided after he turned one to castrate him, how ever when she opened him up was in utter do’s belief, he actually hasn’t got any! She has been high up inside him and cannot find them anywhere, further scans confirmed he does not have any. I’ve been told this is extremely rare, any help or info on this matter would be gratefuly received as I am worried sick!
    Many thanks,
    Claire

  54. Hi, I have a 13 month old whippet × lurcher. Neither of his testicle’s dropped, so after many visits to our vet, she decided after he turned one to castrate him, how ever when she opened him up was in utter do’s belief, he actually hasn’t got any! She has been high up inside him and cannot find them anywhere, further scans confirmed he does not have any. I’ve been told this is extremely rare, any help or info on this matter would be gratefuly received as I am worried sick!
    Many thanks,
    Claire

  55. Hi, I have a Doberman of 16 months who only had one testicle, been waiting and hoping it would drop, I was recommended by my vet to castrate him to find after 4 vets looking he never had another testicle, so I never actually needed to castrate him, I’m now worried it will cause further problems, any advice would be great.

    Many thanks
    Michelle

    1. Hi Michelle, it was right for the vets to operate and search for that testicle due to the health risk of leaving it. As for leaving him un-castrated, it’s not recommended that you breed from a dog with only one testicle anyway. Therefore it sensible to castrate him considering the benefits that come with castration in terms of reducing the risk of tumours, your dog straying in search of a bitch etc. To be doubly sure that there isn’t a testicle remaining which could cause problems, some will have their dog scanned. If you haven’t already, it might be worth speaking with your vet about this option. Thanks for getting in touch, best wishes.

  56. Hi, I have a Doberman of 16 months who only had one testicle, been waiting and hoping it would drop, I was recommended by my vet to castrate him to find after 4 vets looking he never had another testicle, so I never actually needed to castrate him, I’m now worried it will cause further problems, any advice would be great.

    Many thanks
    Michelle

    1. Hi Michelle, it was right for the vets to operate and search for that testicle due to the health risk of leaving it. As for leaving him un-castrated, it’s not recommended that you breed from a dog with only one testicle anyway. Therefore it sensible to castrate him considering the benefits that come with castration in terms of reducing the risk of tumours, your dog straying in search of a bitch etc. To be doubly sure that there isn’t a testicle remaining which could cause problems, some will have their dog scanned. If you haven’t already, it might be worth speaking with your vet about this option. Thanks for getting in touch, best wishes.

  57. Hi. I have a 3 month old American Akita. Only the left testicle has descended. His Veterinarian recommended to have him castrated by 4 months. What is the most I can wait for this breed to see if the other one descends?

    1. Hi Juan, in dogs, both testicles are usually descended by the age of six months however it can take up to a year. In terms of deciding how long you can wait, this is best talked through with your vet who can assess the situation based on your dogs level of maturity by examining him. Don’t forget, you can always go to another vet for a second opinion to ease your mind. Best wishes.

  58. Hi. I have a 3 month old American Akita. Only the left testicle has descended. His Veterinarian recommended to have him castrated by 4 months. What is the most I can wait for this breed to see if the other one descends?

    1. Hi Juan, in dogs, both testicles are usually descended by the age of six months however it can take up to a year. In terms of deciding how long you can wait, this is best talked through with your vet who can assess the situation based on your dogs level of maturity by examining him. Don’t forget, you can always go to another vet for a second opinion to ease your mind. Best wishes.

  59. I have a male Shepard they just turned 6 months old with only one testicle so far. There was a time when you could see the second testicle but it had not dropped. I was not worried thinking it would soon but now there is no sign of it. My first question is , If the second one was to drop, would this be a bad trait to have for breeding? My second question is, is now a good time to have him fixed and have the vet search for the second testicle, or would you recommend waiting for a full year and then have it done? Your opinion and service is greatly appreciated! I thank you and my dog thanks you…. Dave

    1. Hi Dave, in terms of ‘best time to neuter’, particularly with a larger breed of dog, it is hard to say without knowing his history and without examining him, that is why it really is best that you discuss that in consultation with your vet. It can take up to a year for the testicles to fully descend so as for whether he should be ‘written off’ as a breeding dog, again, your vet is best placed t help to decide. If you do wait a while and they both descend, your vet can judge whether they are ‘normal’ and healthy for breeding. It is worth liaising with the vet too to determine that he is suitable for breeding in a more general sense (health and temperament) and really considering if it’s something you want to embark upon e.g can you find sensible owners for puppies considering this highly wonderful but intelligent breed with a high exercise and mental stimulation requirement. I hope that helps in some way.

  60. I have a male Shepard they just turned 6 months old with only one testicle so far. There was a time when you could see the second testicle but it had not dropped. I was not worried thinking it would soon but now there is no sign of it. My first question is , If the second one was to drop, would this be a bad trait to have for breeding? My second question is, is now a good time to have him fixed and have the vet search for the second testicle, or would you recommend waiting for a full year and then have it done? Your opinion and service is greatly appreciated! I thank you and my dog thanks you…. Dave

    1. Hi Dave, in terms of ‘best time to neuter’, particularly with a larger breed of dog, it is hard to say without knowing his history and without examining him, that is why it really is best that you discuss that in consultation with your vet. It can take up to a year for the testicles to fully descend so as for whether he should be ‘written off’ as a breeding dog, again, your vet is best placed t help to decide. If you do wait a while and they both descend, your vet can judge whether they are ‘normal’ and healthy for breeding. It is worth liaising with the vet too to determine that he is suitable for breeding in a more general sense (health and temperament) and really considering if it’s something you want to embark upon e.g can you find sensible owners for puppies considering this highly wonderful but intelligent breed with a high exercise and mental stimulation requirement. I hope that helps in some way.

  61. Hi I have a 3 kg jack x chihuahua
    He only has one testicle. Ive been asking the vet to castrate him since I bought him one year ago he is about 2 now but He is a sprayer. And sprays everywhere downstairs regardless easy open access outside all times.
    vet initially kept putting me off doing the castration saying because unsure of his exact age. Kept saying wait to see if other one drops. After a year I’m not happy with that vets service.
    I’ve just rang another vet to be told it’s a costlier castration bill as they have to locate lost testicle deep inside because it cannot be felt. it can be very dangerous in long term if left. It’s really a must and Not so much a choice. So instead of looking at £150 bill I’m now looking at a £450 bill. I’m very annoyed this was not explained at previous vets. I am going to write to complain as theyre part of national known group of vets.. im shocked at such huge difference in price that I really can’t afford. The most help I can get is
    £50 voucher from national dog charity.

  62. Hi I have a 3 kg jack x chihuahua
    He only has one testicle. Ive been asking the vet to castrate him since I bought him one year ago he is about 2 now but He is a sprayer. And sprays everywhere downstairs regardless easy open access outside all times.
    vet initially kept putting me off doing the castration saying because unsure of his exact age. Kept saying wait to see if other one drops. After a year I’m not happy with that vets service.
    I’ve just rang another vet to be told it’s a costlier castration bill as they have to locate lost testicle deep inside because it cannot be felt. it can be very dangerous in long term if left. It’s really a must and Not so much a choice. So instead of looking at £150 bill I’m now looking at a £450 bill. I’m very annoyed this was not explained at previous vets. I am going to write to complain as theyre part of national known group of vets.. im shocked at such huge difference in price that I really can’t afford. The most help I can get is
    £50 voucher from national dog charity.

  63. I have a pitbull, and he will be a year next month on the 27th. One of his testicles have dropped and has been for the the better part of his life , recently we’ve notice that what appears to be the his missing testicles; in his abdomen kind of toward his thigh , I don’t know if it is on the course to the scrotum. Can this cause any other diseases, or make him sick? If it doesn’t drop do I have to get him neutered? I’m going to take him to the vet, for a check up , and to get my veterinarians opinion, but I would like some reassurance to make sure he’s okay until his upcoming appointment. Thanks in advanced!

    1. Hi Hailey, we are reaching a point whereby both of those testicles really should have descended by now since he is coming up to 1 year. Have him checked by your vet to see if they agree. An un-descended testicle can become cancerous so yes, it would definitely be recommended to have this one removed. It isn’t recommended to breed from a cryptorchid dog and therefore why not have him fully castrated and reap benefits of doing so? We’re pleased you have an appointment booked to see your vet and we hope our comments help. Best wishes.

  64. I have a pitbull, and he will be a year next month on the 27th. One of his testicles have dropped and has been for the the better part of his life , recently we’ve notice that what appears to be the his missing testicles; in his abdomen kind of toward his thigh , I don’t know if it is on the course to the scrotum. Can this cause any other diseases, or make him sick? If it doesn’t drop do I have to get him neutered? I’m going to take him to the vet, for a check up , and to get my veterinarians opinion, but I would like some reassurance to make sure he’s okay until his upcoming appointment. Thanks in advanced!

    1. Hi Hailey, we are reaching a point whereby both of those testicles really should have descended by now since he is coming up to 1 year. Have him checked by your vet to see if they agree. An un-descended testicle can become cancerous so yes, it would definitely be recommended to have this one removed. It isn’t recommended to breed from a cryptorchid dog and therefore why not have him fully castrated and reap benefits of doing so? We’re pleased you have an appointment booked to see your vet and we hope our comments help. Best wishes.

  65. What is it called when a male cat is truly born with only one testicle? My vet did his nuter today, explored his abdomen, and no testicle. Just curious.

  66. What is it called when a male cat is truly born with only one testicle? My vet did his nuter today, explored his abdomen, and no testicle. Just curious.

  67. Hi i have a 10 and half month old maltese x, he hasnt had either of his testicles dropped. The first time we took him to get fixed the vet recommend to wait till he will be 9 to 10mnths old now we took him the second time it still hasnt dropped so they said wait till he turns 12mnths. Im concern and unsure of what shall i do.

    1. Hi Tanweer, it can take up to a year for both testicles to descend however smaller breeds tend to mature more quickly than larger breeds and most will be developed by 6 months of age. Don’t panic however it would be worth going back to your vet to talk your concerns through with them. Alternatively you can always go for a second opinion. You are obviously aware that if they do not descend, he will need to be castrated. Best wishes.

  68. Hi i have a 10 and half month old maltese x, he hasnt had either of his testicles dropped. The first time we took him to get fixed the vet recommend to wait till he will be 9 to 10mnths old now we took him the second time it still hasnt dropped so they said wait till he turns 12mnths. Im concern and unsure of what shall i do.

    1. Hi Tanweer, it can take up to a year for both testicles to descend however smaller breeds tend to mature more quickly than larger breeds and most will be developed by 6 months of age. Don’t panic however it would be worth going back to your vet to talk your concerns through with them. Alternatively you can always go for a second opinion. You are obviously aware that if they do not descend, he will need to be castrated. Best wishes.

  69. Hello,

    I have a one year 3 month old pure bred walker coonhound that has both testicles in his scrotum, but I noticed that within the last two days, one of them has gotten almost 5 times the size of the other one. It is pink-reddish colored. I am wondering if this is normal and them are just growing in size or if this could be an indication of a larger issue.

    Thanks in advance.

    1. Thanks for getting in touch Amber. This doesn’t sound normal, that’s quite a difference in size and it sounds like a very sudden change. We’d recommend taking him to your vet as soon as possible to be examined. Best wishes.

  70. Hello,

    I have a one year 3 month old pure bred walker coonhound that has both testicles in his scrotum, but I noticed that within the last two days, one of them has gotten almost 5 times the size of the other one. It is pink-reddish colored. I am wondering if this is normal and them are just growing in size or if this could be an indication of a larger issue.

    Thanks in advance.

    1. Thanks for getting in touch Amber. This doesn’t sound normal, that’s quite a difference in size and it sounds like a very sudden change. We’d recommend taking him to your vet as soon as possible to be examined. Best wishes.

  71. My GSD 7 months, only 1 ball has dropped and it sounds strange but i looks like the missing one is at the base of his penis. Could that even be possible?

    1. Hi Alli, when one testicle fails to descend, it’s necessary for your vet to seek out that testicle in order to prevent future problems. If you think you can visualise his second testicle then point it out to your vet when you take him to be examined. Best wishes

  72. My GSD 7 months, only 1 ball has dropped and it sounds strange but i looks like the missing one is at the base of his penis. Could that even be possible?

    1. Hi Alli, when one testicle fails to descend, it’s necessary for your vet to seek out that testicle in order to prevent future problems. If you think you can visualise his second testicle then point it out to your vet when you take him to be examined. Best wishes

  73. I have a 3 year pomeranian with only one testicle. Lately he has been very irritated at his rectum. I thought maybe it could be worms but he will stop being irritated and act normal. I just put my hand on his butt and noticed a knot in or by his rectum that feels like the other testicle. Can they pull it down in the sac or would he have to be castrated?

    1. Hi Ava, I would recommend that you have him examined ASAP by your vet. An un-descended testicle can turn cancerous and therefore needs to be removed. The signs of discomfort he is displaying are also cause to be examined by a vet. It is not recommended to breed from a dog whose testicles haven’t fully descended anyway. We wish your Pomeranian the very best.

  74. I have a 3 year pomeranian with only one testicle. Lately he has been very irritated at his rectum. I thought maybe it could be worms but he will stop being irritated and act normal. I just put my hand on his butt and noticed a knot in or by his rectum that feels like the other testicle. Can they pull it down in the sac or would he have to be castrated?

    1. Hi Ava, I would recommend that you have him examined ASAP by your vet. An un-descended testicle can turn cancerous and therefore needs to be removed. The signs of discomfort he is displaying are also cause to be examined by a vet. It is not recommended to breed from a dog whose testicles haven’t fully descended anyway. We wish your Pomeranian the very best.

  75. Hi I have a 1 year old chihuahua and he has 1 testical, is other one is eaither in his stomach or in his gloin. If it is in his tummy we have to pay £500 and if it’s in it gloin we have to play £800. I am really worried that he might get a tumour. Please help

    1. Hi Olivia, it is important that the second testicle is located so you are dong the right thing by having him operated on. Best wishes

  76. Hi, I’ve got a 2 year old whippet x lurcher, by the time he was 6 months old, I took him to my vet as neither of his testicles had decended, I was told to return when he had turned 1, we did, but still no testes had appeared! My vet was sure they were inside, so she had him there for the day to perform the procedure, to find he actualy didn’t have any at all…They were now where to be seen. At the time, (12 months ago) I was told to return in a years time to have a scan done on him to make sure they hadn’t grown in the last 12 months. I’ve recently been back in touch with my vet about it, and she has now decided to just leave him be. I’m wondering if a scan would be a good idea if nothing else for peace of mind for me. Myself or my vet have ever heard of this before, a dog not forming testicles… Is this exceptional rare?? Any help or info will be gratefuly received!

    1. Hi Claire. This does sound very unusual and is certainly incredibly rare. I’d recommend chatting to your vet further about this and about the possibility of the scan, as you say, for your peace of mind. Your vet will know the history of your dog, and if they don’t feel there’s any further investigation necessary, they will have reasons for this that you need to know as it’s important you have all of the information to hand to make the best decision.

  77. I have just had by puppy castrated but only one testicle was down and the vet had to search for the other one. he couldn’t find the other one. Is it possible that he only had one testicle? If not could an X-ray have helped find the other one.

    1. Hi Patricia. It’s difficult to comment really without knowing your dog’s history and what they did in terms of searching for the other testicle. If you have questions or concerns, I’d recommend having a further chat to your vet who will be happy to answer any questions you have.

  78. My 3 year old miniature schnauzer has one retained testicle, although it cannot be felt (so presumably is in his abdomen). He is going in for surgery to have it found and removed. However I am yet to find an answer as to why vets feel the need to take the other, seemingly healthy testicle away, other than it can be passed on if breeding the dog. I am not planning on breeding him, so I would be grateful of someone could maybe clarify whether there are any other medical benefits of taking the other healthy one away?

    1. Hi Michelle. There are many benefits to routine castration, such as reducing the risk of testicular cancer and prostate disease, reducing the urge to wander etc., and those same benefits would apply here. If you’re not sure about the procedure or would like further information about the health benefits and why your vet feels it’s advisable to perform a full castration, I’d recommend having a chat with them. They’ll be happy to answer any questions you have and know your dog, so are best-placed to give you a full explanation.

  79. I have a Chihuahua and he will be four years he only has one testicle and it hasn’t dropped what does this mean because I just recently got another female Chihuahua and I wanted them to breed

    1. Hi Mary, we’d recommend having a chat to your vet as they will know your dog better. We usually always recommend castration as the testicle left in the abdomen has the potential to turn cancerous, but your vet will be able to run through your options with you.

  80. My 2 year old dog has only 1 testicle and I have his 7 month old sister. Can she get pregnant even if there sre brother and sister

    1. Hi Leslie. Yes, she can get pregnant – being related won’t make any difference, unfortunately. To avoid any unwanted litters, we’d recommend having a chat to your vet about neutering both dogs – there are health benefits that your vet can run through for both spaying and castration too, especially if your dog only has one testicle descended.

    1. Hi Lisa. I wouldn’t worry too much yet as he’s very young. Have a chat to your vet when you take him in for vaccinations etc and they’ll give him a thorough examination and will be able to advise you of at what point they’d expect both to have descended. They may want to do another check-up on him at around 6 months to check, and then can advise you of the best course of action for him.

  81. Hi, my Maltese chihuahua is 1 year old and has only one testicle dropped and abit worried,
    It’s been two nights s in a row that he has woke me up during the night and acting abit funny.

    1. Hi Rebecca. Try not to worry, although I know this is easier said than done! I’d recommend giving your vet a call and popping down for a check-up. Your vet will be able to give your boy a thorough check over and advise what they think the best course of action is, and what the next steps are for you.

      1. Hi, can you tell me if I am late to get my dog castrations? My German Shepherd dog is 10 month old now and he has both retained Testicles. Do I have to wait for a year to see if they drop or should I get him to the vet to get castrations? Sorry don’t mind my grammar I’m from SOUTHEAST ASIA.

        1. Hello, they would have probably dropped down by now, I’d strongly suggest getting him to the vet and let them check – they might want to castrate sooner rather than wait. Dave RVN.

  82. I have a ten.month old australian silky only seems to have dropped one testies is there a chance that the other one will drop as I read in your article that it could take up to a year

    1. Hello Yvonne, thank you for your question. It is possible the other one will descend, many times it is according to where it is. Have you had your vet check him? Sometimes it can be felt hiding! If you haven’t had him checked recently, it is worth having your vet examining him to give you further advice. Dave RVN

    1. In general, it’s a bad idea. Cryptorchidism (one or two retained testicles) is a genetic condition, and any dog pups he sired would be at very high risk of the condition. In addition, any bitches would be carrying the genes putting their own future pups at risk.
      In addition, dogs with retained testicles are at a roughly 9 times higher risk of some types of testicular cancer, and as a result, most vets recommend removing both testicles (not just the retained one) to prevent the spread of the condition in the gene pool, and also to protect the dog from testicular tumours.
      That said, I think this is a conversation it’s worth having with your own vet who knows your dog and his medical history, and perform a clinical examination. It may be, for example, that the “missing” testicle is just a bit shy, and there isn’t a significant problem!

  83. I have a full blooded lab and only one of his testicles dropped I understand that it can cause cancerous tissue and a lesser Candidate for breeding but can the testicle that is possibly in the abdomen area… Could it cause him pain… Also im currently staying in a 5th wheel camper i have the hall way that leada to the bathroom and bed room blockes off with a baby gate and if I leave the room to go to bath room or bed room he barks is it bc he has attachment issues or is it bc he can see me but he knows he can’t come back with me? I am fairly concerned about this testicle that has not dropped after a year, I’m wondering about it causing him oain

    1. Yes, it can – abdominal testicles are very prone to twist, and this is reportedly agonisingly painful (the same condition sometimes happens in children). Even a minor twist is likely to be very uncomfortable.
      Regarding his barking, I think it would be best to talk to a qualified canine behaviourist – your vets will be able to recommend one – rather than trying to diagnose a potentially complex issue over the internet!

    1. Yes, a dog with only one descended testicle is just as likely to be fertile as one with two! One testicle is quite capable of producing millions of sperm, and far less than that are needed for pregnancy.

  84. Good day, I’ve got a big concern my Yorkshire Terries is 3 years old and suddenly this morning I realized something is wrong with his testicals as it sits about 4cm from his Penis and not where it is suppose to be. What can I do.

    1. The most likely cause is that it’s cold and the testicle has been pulled up close to the body for warmth! However, this is less probable if it’s only one. Injury or damage to the testicle can cause retraction like that, so if it’s happened suddenly and isn’t just a temporary thing (because he’s knocked it on something!), then I’d suggest getting him checked out by your vet.

  85. My doggys tecticals is pulled up close to his penis. He is 3 years old a Yorkshire Terrier, what caused this to happen yesterday he was still fine.

    1. This occurs occasionally after fighting or trauma; it requires emergency veterinary attention as the protruded testicle is gangrenous. Failure to get treatment may be life threatening and is a massive animal welfare issues. In many countries, failing to take your cat to a veterinarian with injuries like that would be a criminal offence.

  86. I am fosting a six month old kitten who is blind and has nerve damage in his spine, I went to get him fixed a couple weeks ago and the vet found only one testicle, so the vet opened him up to search for it but could not find it. When I got the kitten back the last 4 months of physio I have given it had been undone and the nerve was fully damaged again. The vet said he wants to look for it again in 6-8 weeks, but if he could not find it the first time and was so rough with his spine I’m uncomfortable having him even touch the kitten again. He is a good vet who specializes in fixing animals, I am wondering the chances of the kitten being born with only one testicle? If there is no chance I will spend the extra money and take him someplace better to have it removed.

    1. It is possible for a cat to be born monorchid (with only one testicle) but it is very rare (probably no more than 1 in 1000). Cryptorchidism (one undescended testicle) is about 17 times more likely. There are blood tests that can be done to determine if he has any functional testicular tissue after the external one has been removed, so you could consider that option? If surgery is needed, a minimally invasive “keyhole” technique might be suitable, which would minimise any further tissue damage. Hope that’s helpful!

  87. Hi , i have a 5 month old German shepherd who only has one testicle descended. The other is next to his penis area. What is the likelihood it will drop?

    1. I’ve not been able to find any reliable statistics I’m afraid! I would say that there’s a chance that, as he enters puberty, it will descend; however, if not, then we would recommend surgery to remove both as the undescended testicle is at a significantly increased risk of twisting or cancer. You can read more about the condition here.

  88. Hi, my nearly a year old Labrador has been unwell since last Friday. Vomiting after eating and drinking. Our local vet sent him to a hospital on Monday night where he had blood tests and X-rays of his stomach all fine. The conclusion was it was a bug of some sort but since he’s been home I’ve noticed that his testicals are really red but they don’t look swollen. Is this the result of him being ill? Do I need to get him back to the vet again? Best wishes, Jess

    1. It might suggest that he has a fever; however, it isn’t what we’d expect to see after a vomiting bug, so I would advise you to call your vet and have a chat to them about it.

  89. hi there. My staffy is 5 months old and one of his testicles has not dropped. Its actually sitting in his groin about 2cm away from the sac. Im wondering if it is possible to massage the ball into place? I know it sounds a little odd but is it possible to push it down as I can feel it under his leg and it is very close.

    1. Massage might pull the testicle into the scrotum temporarily but it won’t stay there – and it might be painful for him for you to be pulling on his testicles! At 5 months old he’s probably only just starting puberty – as the testicles grow they’ll probably drop further. If not, castration is strongly recommended but given where it is, it shouldn’t be much more complicated to remove than the other one.

  90. My dog was neutered and they said they might not have gotten it all what ever that meant he is 7 now I have a female puppy 7 months old that’s has not yet been spayed and is in heat he’s acting like he wants to do the deed with her can he get her pregnant

    1. Unfortunately, there’s no way to know – because we don’t know what, or how much, was “left behind”. That’s a really unusual situation, as it’s usually very clear whether the testicle has been removed, but presumably there was some sort of complication.
      If it was the internal testicle that might have been at least partially left, then it’s very very unlikely, as the body temperature will almost always render it infertile.
      If it was the external one, it’s possible, but again unlikely, because cutting into the testicle creates massive scarring, which is likely to block the seminiferous tubules. However – it only takes one sperm, so there really is no way to be sure unless you get a semen sample analysed by your vet.

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