Hello,
I'm looking for some veterinary advice regarding my two-year-old male dog, Dexter, who has developed an extremely unusual and escalating fixation on my older male dog, Muffin.
Dexter has always been a gentle, affectionate, relaxed little dog. However, his behaviour has changed dramatically. He now follows Muffin constantly, will not leave him alone, repeatedly attempts to get close to him and becomes extremely distressed when separated.
This has escalated to the point where Dexter has ripped through his crate trying to reach Muffin. He cries persistently and struggles to settle. The behaviour is now virtually continuous, day and night.
What is particularly unusual is that he had a completely normal day recently, when he was relaxed, affectionate and showed no fixation whatsoever. His behaviour then returned to being extreme.
Dexter recently had swollen anal glands, which were treated. He has undergone a physical veterinary examination, during which nothing abnormal was identified, but no blood tests, urine tests or further medical investigations have been undertaken.
He has been referred to a behaviourist, which I fully support. However, I am concerned that a purely behavioural explanation may overlook a medical or hormonal cause, particularly given his age and the dramatic change from his usual temperament.
I've also checked Muffin's anal glands, which appeared normal.
I'm an experienced Dogs Trust foster carer and have received training in dog handling and behavioural management. I've tried various behavioural techniques, but nothing seems to interrupt Dexter's fixation.
Could any of the veterinary professionals here advise:
1. What medical conditions could cause a sudden, intense fixation on another household dog?
2. Could hormonal changes or testosterone-related behaviour be responsible in a male dog who has just turned two?
3. Would blood tests, urine testing or other investigations normally be considered in a case like this?
4. Could anxiety, compulsive behaviour or a neurological condition present in this way?
5. What would you recommend as the next clinical step while we await the behavioural assessment?
I'm not seeking chemical castration or any particular procedure. I simply want to understand what might be happening and ensure that potential medical explanations have been properly considered.
I'm increasingly concerned for Dexter's welfare and for Muffin, who is struggling to get any peace.
Thank you very much for any professional advice.
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