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Puppy's vaccine site bump is growing. Is it a tumor or reaction?

Updated On September 23rd, 2025

Pet's info: Dog | Chihuahua | Female | unspayed

Hi, my puppy has grown a bump in her back and I was wondering what it was ...vet said it was because of the vaccine he had gave her but it's been getting bigger ...can it be a tumor

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1 Answer

Most Helpful Answer

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Answered By Rebecca, DVM

Veterinarian

Published on June 20th, 2017

If the lump is getting bigger it may be worth taking her back to the vet to make sure that it's not infected. A tumor isn't impossible but fairly rare for a young puppy and more likely to be a vaccine reaction if that's where he gave it. Make sure the vet is fully aware as they may want to give her a Premedication before her next vaccines. You can try doing a warm compress on the lump to see if that may decrease some swelling. A warm washcloth every 6-8 hours for 5-10 minutes. I hope Moana is better soon.

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