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My dog's bump is huge, leaking fluid, and smells bad. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Pit Bull Terrier | Female | unspayed

My dog had a little bump by her but now its huge looks nasty and is leaking fluids and stinks what could it be

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2 Answers

Most Helpful Answer

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Answered By Amy S. Eutsey, DVM

Veterinarian

Published on August 25th, 2017

This is certainly a very large lesion. Without seeing it in person, I cannot say what the origin is- but it really looks like a big tumor that has become infected. This really needs quick attention from your vet to determine what type of mass this may be and if surgery can be done to address this. Due to the very large size, it may be very difficult at this point to successfully do surgery, but it will only get worse and bigger- so it needs to be looked at right away.

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    Answered By Ricardo Fernandez, DVM

    Veterinarian, Veterinary Oncology Resident

    Published on

    Hi there! Thanks for using Petco Pet Education Center, formerly Petcoach! This definitely looks like some malignant tumor. Possibilities include sarcoma, carcinoma, mast cell tumor, among many other possibilities. I recommend that you take her to your veterinarian as soon as possible for further assessment with a fine needle aspirate which can help determine the type of tumor. Other diagnostics like chest radiographs should be considered to check if the tumor has already spread or not and see what would be the best option for Bama. At the very least they can start pain control medications and antibiotics as it looks infected and painful. Good luck!

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