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My dog's knee lump tripled in size and turned dark purple. What now?

Updated on September 23rd, 2025

Pet's info: Dog | Olde English Bulldogge | Male | neutered | 7 years and 7 months old | 65 lbs

My dog has had a marble size lump on his knee that that vet has seen and said it was okay however this weekend it has tripled in size and has a dark purple look to it

1 Answer

Most Helpful Answer

Dr. Melanie, BVSc MS

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on May 29th, 2021

I'm concerned that this lump has tripled in size in such a short amount of time, and the color of it as well. Otis should go back to the vet for this to get it checked out, and I would take him into his vet this weekend or first thing Monday. The vet can perform a test called a fine needle aspirate on it. To do this, the vet sticks a small needle into the lump to get a sample of its cells, and examines the cells on a slide under a microscope. It's usually painless to the animal, and relatively quick to perform. Once the cause of the lump is diagnosed, the vet can discuss treatment options if needed. I hope this helps!
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