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My new kitten is vomiting white foam, has diarrhea, and is lethargic.

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 3 months and 15 days old | 2.3 lbs

Hi, I recently adopted my 10 week old kitten about a week ago and took him to the vet a couple days ago to get home checked out. They did a feces test and told me everything looked good and he had no parasites. They also gave him a dewormer. Although, yesterday morning i saw him puke white foam and since then he’s had diarrhea, has had a lack of appetite and is lethargic. What’s wrong with him?

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1 Answer

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Answered By Kevin Sanada, DVM

Veterinarian

Published on December 16th, 2017

It's likely an infection that is causing this. Kittens commonly get gastrointestinal infections at this age and he may have picked it up from the place where he was adopted (incubation periods can be up to two weeks). The fact that he recently got dewormed is coincidental, but I wouldn't be concerned about this being related to the deworming medication. Considering he is lethargic and has vomiting/diarrhea, it's best to have him seen by a vet again. Kittens can quickly become dehydrated with this condition and will likely need some treatment to make him feel better again. For now, it's best to feed a bland diet of boiled chicken. Feed only a little at a time and ensure he has plenty of water available. It will also be helpful to add pedialyte to the water. I hope that helps and Ringo gets better soon.

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