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My dog has a hard lump on her shoulder after Petco bath. What is it?

Updated On September 23rd, 2025

Pet's info: Dog | Mixed Breed Medium (23 - 60lb) | Female | spayed | 25 lbs

Took my dog (Sadie) to Petco for a bath, etc. When we (dog and I) got home I noticed a lump, maybe one inch around and quarter inch high, on her shoulder. Doesn't seem to bother or hurt her. Lump seems hard to the touch. How concerned should I be?

2 Answers

Most Helpful Answer

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Answered By David Darvishian

Veterinarian

Published on August 2nd, 2017

Hi and thanks for using Petco Pet Education Center, formerly Petcoach! Sorry to hear about Sadie. Lumps are always troubling unless they resolve over days to a few weeks. Possible causes for lumps include recent vaccinations, seroma (fluid filled space), hematoma (blood filled space), granuloma (growth consisting of inflammatory cells), cyst (fluid/sebaceous material filled sac), or a tumor which could either be benign or cancer. I would monitor the lump for signs of resolution as noted above. If the lump increases in size or the characteristics change, then I would advise that your vet see Sadie. They can perform a physical exam and then possibly a fine needle aspirate or biopsy of the lump if indicated. Hopefully this will resolve. I wish you and Sadie much luck.

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Other Answers

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    Answered By Dr. Davis

    Veterinarian

    Published on

    This sounds like a normal vaccine reaction, if she was vaccinated in the last week or two. I know they require vaccinations before grooming. Regardless I recommend watching it for any change and if it hasn't gone away in two weeks I would bring her in for an exam. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Sadie.

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