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My senior cat got very sick after a booster shot. Could it be related?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Longhair | Female | spayed | 11 years and 10 months old | 7.75 lbs

My 12 yr. old cat was given the FCVVP booster shot in April of 2017. They would not take her for grooming until she had this. She had a compromised immune system, and the vet was aware of her condition. Within 3 months, she went blind among many other complications.. She died last Thursday. She was so sick. I put her to rest. She was absolutely fine before this shot on 4/29.

1 Answer

Most Helpful Answer

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Answered By Rebeccah Wood

Licensed Veterinary Technician, Registered Laboratory Animal Technologist

Published on August 3rd, 2017

I am so, so sorry to hear about Grace. I know how hard it is to lose a pet, and how difficult it is to make the decision to let them go. It is very unlikely that the FVRCP booster had anything to do with her decline, though I understand how coincidental it appears to be. It is very common for veterinarians to give this shot to older pets and even to immunocompromised animals, as they are the most at risk for the diseases the shot protects against. Without knowing her complete history, it does sound like she had some other issues brewing even before she had the vaccine. Most pets that have a true vaccine reaction exhibit those symptoms within a few hours - not over several months. I am so terribly sorry that you had to see Grace at her sickest, but I know that you did everything you could for her, and that she had the best care right up until you made that difficult decision. Please take comfort in knowing that making the decision to euthanize our pets when they are in intractable pain, though one of the hardest decisions we ever have to make, is the last great gift that we can give them. I hope that the sorrow eases with time, and my thoughts are with you and your family.

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