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Why is my senior dog bleeding from a leg spot and losing weight fast?

Updated on September 23rd, 2025

Pet's info: Dog | American Pit Bull Terrier | Male | neutered | 12 years and 3 months old

My 12 yr old pitbull has a black spot that has extended approximately 1” out from right above knee joint on back of leg. It’s now bleeding a lot. He’s losing weight very fast but eats fine. Drinks fine. Seemingly no pain.

1 Answer

Most Helpful Answer

Ricardo Fernandez, DVM

Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on June 18th, 2018

Thanks for using Petco Pet Education Center, formerly Petcoach! It is hard to know for sure just based on a description. This could be a benign or malignant growth. There is no way of knowing what it is just based on its appearance. This is often differentiated by a test called a fine needle aspirate (FNA) which is a pain free, inexpensive and easy procedure which in most cases will help reach a diagnosis. Sometimes a biopsy is needed for a definitive diagnosis. I recommend that you have him evaluated by a veterinarian for further assessment and treatment as soon as possible as his weight loss and blood loss are quite concerning. I am really hoping for something benign. Good luck and have a good day!
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