Why is my cat tired and not eating after a vaccine booster shot?

Question

My cat had an FVRCP booster shot yesterday and has been very slow to walk, not eating, and sleeping since he received it. He seemed fine for about 5 hours after the shot. Pet's info: Cat | American Shorthair | Male | neutered | 1 year and 5 months old | 6 lbs

Daniel Fonza, DVM · Accepted Answer

Sometimes animals become more lethargic after a vaccination and this typically does not last for more than 24 hours. If you think Havoc is experiencing difficulty breathing, is vomiting or is experiencing hives on the skin, then take him in immediately as he may be experiencing a vaccine reaction. However, if he is just slower than usual and doesn't want to eat right now, I would give it 24 hours after the vaccine has been given and if the symptoms do not resolve, take him back to the veterinarian to be examined to ensure everything is ok. I hope this helps!

Why is my cat tired and not eating after a vaccine booster shot?

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