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My cat got diarrhea from milk. Why is cow's milk bad for cats?

Updated On September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | unspayed | 8 months and 29 days old | 2.75 lbs

Is milk bad for my kitty? So I gave my cat milk for 3 week and trust me she loved it so much that I felt her frowning when I put water instead of milk in front of her but she got diarrhea from it according to the vet and that I shouldnt give it to her anymore... Why is that?

1 Answer

Most Helpful Answer

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Answered By Jessica Desrosiers

Veterinary Technician

Published on July 11th, 2018

If you are feeding cow's milk, then yes it can cause diarrhea in cats. Cats are lactose intolerant, and don't have the right enzymes to properly digest cow (or similar) milk, which can lead to diarrhea. if you'd like to give Moca a "milk" treat, there are specially made cat milk treats that can be found at your local pet store. It has a similar taste to cow's milk that cats like, but shouldn't give them GI upset like regular milk as long as it's given as a treat.

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