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My kitten is sick after vaccine: bloody stool & vomiting. Help!

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed | 2 months and 11 days old | 1lb

Rosie is our 9 week old kitten. We rec'd Rosie a week and a half ago. She seemed healthy and happy. I brought her for her FvRCP vaccine. Since then, she eats very little and has had a very small amount of blood in her bm. Today the blood was a larger amount and she vomited afterwards. No blood in the vomit.

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1 Answer

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Answered By Laura Johnson VMD

Veterinarian

Published on August 22nd, 2017

HI, thanks for using Petco Pet Education Center, formerly Petcoach! Poor Rosie! I am sorry she isn't feeling well! I am worried that Rosie is having a vaccine reaction the the FVRCP. I recommend that you take her to your Vet for a recheck. They likely will give her anti-nausea medications, fluids under the skin and medication for her diarrhea. They may even give her a steroid injection for the vaccine reaction. She is very little and dehydration can set in quickly. The blood is likely from inflammation in the colon. Other causes for vomiting and diarrhea in a young kitten are: intestinal parasites, viral or bacterial infections, dietary indiscretion, food sensitivity and toxins. I hope this helps and I hope Rosie is back to herself very soon!

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