Huge bump/ball inside my dog mouth

Hello! Hope everyone is doing good. Hopefully we can get some good info here, we noticed a huge ball inside our female dog’s mouth. Photo attached. Apparently is getting bigger and spreading to the roof of the mouth within weeks. As soon as we noticed it, took it to the vet, he medicate her with antibiotics and anti-inflammatory for a week, and is bigger after 7 days of medication. We went again and now we will do a surgery to remove it on Monday. (2 days left). We still don’t know what is, neither our vet. We live in Dominican Republic, taking her to the best vet available. My girlfriend is getting crazy and me too, thinking it can be cancer. But i really don’t think so, she’s a boston terrier 2 years old, we often play in grass with a tennis ball, one day in february, she was doing strange things and bleeding a bit after playing, what makes sense to me is that she bit the ball (really hard as always) and she probably stuck a burdock (small pointed thing in grass, we have some of those where we play in the grass) in her gum. If someone know something please help us with any recommendations🙏. We are really worried

here's the photo.

Hello.  A foreign body (sharp seed etc) might explain this lump, but so might cancer - malignant or otherwise - gum and dental disease.  It sounds as though your vet has a plan in mind for examining the mouth under general anaesthetic and taking things from there, which seems a good idea.  I wonder if there are also parasites where you live that could cause it, for example. Good questions for your vet include 'what is on your differentials list' and 'how will you tell the difference between these things?' Wishing you all the best and please do let us know how you get on.

Hey Liz! Thank you so much!!   We went to a specialized oncologist vet, he did a biopsy, we need to wait 10 days to get results. I wonder if is not better to do an imaging test, remove the tumor surgically, and then send the whole tumor to check. If it's malign it can spread, if it's not malign , removing it faster would have better chance so doesn't affect a bone of the jaw or teeth.

Thats a good question and best asked of your oncologist, who can explain the decision as they made it, with reasons.  Never worry about asking questions of experts; its their job to tell you the answers.  'Is ten days not too long to wait?' Is a perfectly reasonable question.  I am not an oncologist, so my ideas here are only a guess. It sounds as though their priority at the moment, is to understad the pattern of cells within the lump i.e. what the lump is - cancer, infection, benign growth and further, the TYPE of cancer or infection or benign growth and how it is likely to behave.  The type of cells within the lump influence  a) whether it will simply grow back if it is removed b) how much of the lump needs to be removed - and how much 'normal' tissue around it - many vets default to 2cm in each direction if they don't know, but this is not always possible in a mouth cavity because there are teeth / jawbones in the way!  c) whether there is a better, chemical way of tackling the lump ie with drugs rather than removal d) whether the lump needs to be removed at all.    This lump may be rather big and difficult to remove - I do not know the extent of it but it looks to be very closely adhered to the tooth and the jaw - so knowing what it is and how it is likely to behave, rather than jumping in and  removing tooth and jaw tissue, sounds to be a reasonable idea to me.  The cost of doing this seems to be money and time.  It sounds as though your specialist has decided, that the delay in identifying the lump is worth the wait of ten days.

Sorry:  .... that the advantages of identifying the lump, are worth the wait of ten days.

thank you so much Liz!! God bless you