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What causes diarrhea in 8-year-old cats and what food helps?

Updated on September 23rd, 2025

Pet's info: Cat | Mixed Breed | Female | spayed | 8 years and 7 months old | 8 lbs

Hi, my 8 year old cat has diarrhoea, no idea why but she seems sensitive/allergic to foods recently, changed from whiskas as was making her vomit, now on purina one which gives diarrhoea, could you advise a better good please or any other possible causes? Many thanks

1 Answer

Most Helpful Answer

Lauren Kennedy, DVM

Answered By Lauren Kennedy, DVM

Veterinarian

Published on September 2nd, 2017

It sounds like your cat has a severe case of colitis, or an inflammation of the colon. This condition causes diarrhea.

Colitis can be caused by many different things. Some of the more common causes include intestinal parasites, dietary indiscretion, food intolerance, irritable bowel disease, pancreatitis, a foreign body/blockage and viruses.

Food intolerances/allergies can start at any age. This is why it may only now be affecting Ella when she has been eating the same food for a long time.

If the diarrhea is server you may want to consider taking Ella to the vet. She may need fluids to correct any dehydration, a fecal examination performed and antibiotics and/or probiotics to help the diarrhea clear up.

There are specific prescription diets that your vet can recommend to help with this type of issue. Two I commonly recommend are Hill's i/d and Royal Canin GI low fat. A hydrolyzed protein diet may also be helpful.

If you want to try an over the counter food first I would recommend something that is labeled as "limited ingredient" or for "sensitive stomachs".

I hope this helps. Thanks for using Petco Pet Education Center, formerly Petcoach. Best of luck.
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