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My old dog's non-cancerous lump is bleeding and red. What should I do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 90 lbs

Hello, I have a female mixed breed dog and she is about 13. She has had a hard lump on her side for a couple years and we were told it was non cancerous and nothing to worry about, that it was just a lump dogs get when old. Today I noticed it started bleeding and now is all red and still bleeding. It is also black and hard looking

1 Answer

Most Helpful Answer

Laura Johnson VMD

Answered By Laura Johnson VMD

Veterinarian

Published on November 13th, 2017

Hi, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Piper!

The only way we can 100% know for sure a mass isn't cancerous is by either aspirating the mass with a needle or biopsying it. When a mass changes I always recommend that the animal be seen by their Vet to have it checked. The fact the mass opened up dictates the need to have it looked at and a minimum of antibiotics started. Hopefully it is just a ruptured follicular cyst that is infected. But I think you should have the mass removed and biopsied. I am afraid it will not heal well and continually leak bloody fluid.

I hope this helps and I wish Piper the best!
Vote Icon1Pet Parents found this answer helpful

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