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My old Mastiff has a black tail bump & trouble standing. What to do?

Updated On September 23rd, 2025

Pet's info: Dog | Mastiff | Male | neutered | 132 lbs

I have an english mastiff, namely Bheem. He's 12yrs old. I noticed a huge black bump on his tail a month ago. I don't know what it is. He is also having trouble in getting up. I have pick him up in order for him to stand. What should I do.

1 Answer

Most Helpful Answer

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Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on March 5th, 2017

It sounds like Bheem has a few things going on at the moment. Unfortunately, in a senior dog, a large bump could be a malignant tumor. It could also be due to a cyst or a benign tumor. Given that he's having trouble standing up, he would have problems with his hips, spine, and joints, which is common in giant breed dogs. He could be suffering from arthritis or degenerative joint disease. I would have him seen by a vet right away for these problems. The vet can diagnose what is causing his problems and can discuss treatment options without you.

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