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My dog has a sudden, painless lump on its rib cage. What could it be?

Updated On September 23rd, 2025

Pet's info: Dog | Golden Retriever | Male | neutered | 1 year and 11 months old | 80 lbs

2yr old golden/lab with lump on rib cage behind shoulder. Very quick onset, within hours. No pain or itching. About 2in long and 1in wide. Lump feels hard toward the shoulder and softens. No redness, puncture or bite marks. What could it be?

2 Answers

Most Helpful Answer

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Answered By Dr. Davis

Veterinarian

Published on September 23rd, 2017

This could be a bruise from and injury, a cyst, an insect bite or an abscess. As long as it's not painful, red or getting bigger then I would just keep an eye on it. I expect it will get smaller daily and should be gone in a few days to a week. If it doesn't get smaller or changes then a veterinary exam is recommended. With your description this is nothing I would be concerned about. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Merlin.

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    Answered By Dr. Dayna, DVM, CVA

    Veterinarian, Certified Veterinary Acupuncturist

    Published on October 10th, 2017

    By the picture it also looks like the skin is bruised. An infection (abscess) is high on my list, but other possibilities such as a tumor are likely as well. Teeny needs to be evaluated by a veterinarian today if possible. If that is a large infection it will need to be drained and antibiotics will need to be started. Good luck! I hope he heals soon!

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