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Why is my cat sneezing constantly after a combo vaccine shot?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Female | spayed | 11 years and 1 month old | 16 lbs

My cat got the respitory/leukemia combo injection vaccination at our vet and is now sneezing constantly less than one week later, did the vaccine cause the symptom of URD?

1 Answer

Most Helpful Answer

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Answered By Jenny, DVM

Veterinarian

Published on August 7th, 2017

It is unlikely the vaccine caused it, but it does stimulate the immune system. So if was previously exposed and trying to fight the infection already, this may have pushed it over the edge and be too much for him to continue to handle on his own. Some sneezing can also be a sign of allergies. You vet can recheck him to see if medication is needed.

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1Pet Parents found this answer helpful

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