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

Question

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

Dr. Davis · Accepted Answer

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.

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

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