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My cat has diarrhea on weight control food. Should I switch back?

Updated On September 23rd, 2025

Pet's info: Cat | Domestic Mediumhair | Female | spayed | 6 years and 11 months old

Hi. I have a 6 yr old female cat. I have always fed iams adult (dry) She had a muscle problem about a year ago and was on steroids for 2 months and over the last few months she has turned into a house cat. She has put on a lot of weight so i have changed her diet to iams weight control. She has started to get diarrhoea, which normally happens if she eats any other cat food. Could you advise me whether to put her back on iams adult or keep going with the weight loss food to see how she goes. Ty

1 Answer

Most Helpful Answer

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Answered By Linda G, MS, DVM

Veterinarian

Published on December 22nd, 2017

Hello. Holly may have developed diarrhea from the higher fiber content in the weight control diet. I think I might try feeding a 50-50 mix of the 2 foods to see if that controls the diarrhea. If she continues to have loose stools, then adding a probiotic, like Purina's feline Forti Flora might help. If you do switch her back to the regular adult Iams, you will either need to feed her a lesser amount or put some of the kibble into an activity food ball. This way, she will receive a little extra exercise will snacking on her food. Thank you for using Petco Pet Education Center, formerly Petcoach.

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