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My name is***** and I am sorry to hear that your dog has a mass on his anus. There are two different kinds of masses we see on the anus of dogs- perianal adenoma and perianal adenocarcinoma. The adenomas are benign and can just become uncomfortable due to their size and location, but do not spread to other parts of the body. The adenocarcinomas are very aggressive tumors that will spread quickly to other parts of the body (especially the lungs) and be the cause of death within months.
If your dog is still alive and doing well, in spite of the mass, I would suspect that you are dealing with the adenoma type of tumor.
I would recommend seeking a second opinion on the mass. These can be surgically removed or at least debulked (reduce the size of the mass) to make the pet more comfortable. You can also consider a biopsy of the mass before major surgery for a confirmation on its true nature. You can also consult a veterinary oncologist who can walk you through all of the options and recommend a surgeon for the biopsy and removal.
Does this help? Do you have any more questions?
Kansas State University,
College of Veterinary Medicine Class of 2001
How is your dog this evening? Were you able to find a new vet to discuss surgical options for the mass? Do you have any more questions for me?
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