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My dog has a huge, non-painful lump after vaccination. Should I worry?

Updated On September 23rd, 2025

Pet's info: Dog | German Shepherd | Female | unspayed | 2 years and 8 months old | 64 lbs

I gave my 3 dogs their annual vaccinations, and one of them has a HUGE lump/swelling at the site of injection. I understand its normal for them to get swelling after vaccination but its really big. Its not painful to her at all but should i be worried

2 Answers

Most Helpful Answer

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Answered By Dr. Davis

Veterinarian

Published on March 22nd, 2018

A huge swelling isn’t normal. It could be a developing abscess or hematoma. I recommend a veterinary exam and aspirate of the swelling to determine the cause. You can use a hot compress on it to see if the swelling will go down. Thanks for using Petco Pet Education Center, formerly Petcoach to help you care for Rita.

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2Pet Parents found this answer helpful

Other Answers

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    Answered By Maria DVM

    Veterinarian

    Published on April 26th, 2018

    Ws the lump there prior to the vaccinations? If so and it is getting larger I would recommend having your veterinarian aspirate it to make sure it is nothing to be concerned about. If the lump came after the vaccinations and she had a vaccination in that location then it can be from the vaccination. If you do not remember if one was given in that location then I would call your veterinarian to make sure. With her being so young it is less likely for it to be something concerning but if changing I would have your vet take a look. Thank you for using Petco Pet Education Center, formerly Petcoach.

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