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Why is my kitten vomiting, not eating, and losing weight after shots?

Updated On September 23rd, 2025

Pet's info: Cat | American Shorthair | Female | unspayed | 3 months and 11 days old | 3 lbs

It has now been two days after my 14 week old kittens shot. She is not eating, throwing up, still energetic, and acting shy and weird. It seems like she is losing weight. Will this pass?

1 Answer

Most Helpful Answer

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Answered By Rodrigo Roca, DVM

Veterinarian

Published on July 23rd, 2017

Hello, sorry to hear about Cello. This could be considered a type of delayed vaccine reaction and can be either due to pain at the injection site or a direct reaction in her stomach. If she is vomiting a lot, then I would definitely recommend she is seen by a veterinarian to avoid severe dehydration. However, there is a chance that this may pass on its own if you monitor her for the rest of the day. On the other hand, there are other things that can cause a decreased appetite and vomiting such as foreign bodies, worms, and viruses. So if you think Cello is feeling ill, then consider visiting your veterinarian sooner rather than later. Hope this helps.

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