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My kitten has loose stool after new food. What can I give him?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Shorthair | Male | unneutered | 6 months and 20 days old | 5 lbs

My 5 month old cat has had loose stool since Nov 11th. We switched foods that day to a better quality food because he was picky about the "cheap" food. He is not vomiting, not lethargic, has plenty of energy. On the 19th we started to gradually change him to a grain free food to see if it would help, but he still has loose stool. Is it safe to try an antidiarrhea medicine to help stop the diarrhea while he is getting used to the new food? Or could it be from something else?

1 Answer

Most Helpful Answer

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Answered By Daniel Fonza, DVM

Veterinarian

Published on November 21st, 2017

Hi there and thank you for using Pet Coach to address your concern! I would recommend continuing the current diet you recently switched to as it may take 3-4 weeks to see a change in the stool. I would also add in a probiotic such as Purina Fortiflora. If there is no improvement after this food trial or the stool becomes more loose, I would bring a sample of stool in to your vet to have it checked for intestinal parasites. This may be a food allergy and a novel protein may be needed (a protein he has never had before such as Salmon or Venison if he has never had this). I hope this helps! Please let me know if you have any other questions or concerns.

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