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Why is my cat lethargic and acting strange after vet vaccines?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Male | neutered | 2 years and 5 months old

I took my cat to the vet yesterday for his yearly vaccines and now he is just laying around and not acting like himself?

1 Answer

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on July 2nd, 2017

It is possible that Smokey is experiencing a vaccine reaction they can have a fever and be lethargic for 24 hours after the injections. If it persist longer than that I would return to the vet for medication. Be sure to notify your vet of this reaction so they can premed or split up the injections in the future

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