Petco Text Logo
Petco Pet Logo

Why is my cat refusing food and having diarrhea after deworming?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | neutered | 1 year and 10 months old | 11.02 lbs

I give my cat wet food every 2 days, but 2 days ago I put in a dewormer mixed it in his wet food the name is marltons dewormer its a yellow colour liquid he took a few bites and refuses to eat it today I have given him wet food again but he refuses to eat it, he drank some milk & lots of water but u haven't seen him eating any fry food aswell, he has lose stool and this has been an issue for a while I did take him to the vet they said to change s diet and it will improve but still lose stool

This question includes photos that may contain sensitive content. Click to view.

View more to consider that the photos may include sensitive content.

1 Answer

Most Helpful Answer

Image profile

Answered By Dr. Melanie, BVSc MS

Veterinarian

Published on October 13th, 2019

Poor Monster. Don't give him milk. Cats are lactose intolerant, and the milk is likely making things worse. Feed him a bland diet of boiled white meat chicken (no bones) in small amounts several times a day for a couple of days. Then slowly add back in his normal diet. If the diarrhea continues on the bland diet, he starts vomiting food, stops drinking water, starts vomiting water, or becomes very lethargic, he will need to see a vet right away.

Vote icon

1Pet Parents found this answer helpful

image
Have A Vet Question?

Book an appointment with the pros – our expert vets are here to help.

Sponsored