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My puppy has a rash with bumps after getting shots. What should I do?

Updated on September 23rd, 2025

Pet's info: Dog | Mixed Breed Small (up to 22lb) | Male | unneutered | 1 month and 17 days old | 11.9 lbs

My puppy is 8 weeks and just got his shots and he's starting to have a rash with boils or pimples in it can you tell me what it is and how to treat it

1 Answer

Most Helpful Answer

Vanessa Yeager DVM MPH

Answered By Vanessa Yeager DVM MPH

Veterinarian

Published on September 28th, 2017

Hi and thanks for your post on Petco Pet Education Center, formerly Petcoach this afternoon!

If the rash had appeared 24 hours after the vaccines, it is most likely not a reaction to the vaccines. Typically reactions to vaccines are vomiting, diarrhea, hives all over the skin and swelling of the face or paws within 24 hours after vaccine administration.

The rash could be caused by a flea allergy especially if the rash is around his tail region and Kilo is not on any flea preventative. Fleas like to hang out around the tail region, so this may be a possibility. It only takes one flea to induce a flea allergy.

The rash could also be caused by a bacterial infection which can be common in puppies to have.

My advice is to get Kilo on a flea preventative product from your veterinarian and use a mild cleansing cloth around the rash a few times daily. If it doesn't improve in a few days or gets worse, I would see your veterinarian- Kilo may need to receive antibiotics.

Thanks so much for posting and best wishes to you!
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