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My dog has new bumps after her rattlesnake vaccine. What now?

Updated On September 23rd, 2025

After my dog received the rattle snake shot she received a bump. I took her to the vet and they told me it was just an adverse reaction. Now she has a second bump a bit higher up.

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1 Answer

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Answered By Ricardo Fernandez, DVM

Veterinarian, Veterinary Oncology Resident

Published on August 7th, 2019

Thanks for using Petco Pet Education Center, formerly Petcoach! This is certainly concerning and not typical after a vaccine though possible. I would recommend you check in with your veterinarian as they know exactly where they put the vaccine and how expected or not expected this is. They may for example recommend anti-inflammatory medications or possibly sampling that lesion to make sure it is not something else such as an infection or growth that needs to be treated. I am hoping for a speedy recovery!

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