For many cats, diarrhea is a normal part of life. It doesn’t mean your cat is sick, and it isn’t always easy to predict when it will happen or why. Diarrhea can be caused by certain foods, such as canned food and dry food in pouches. Canned and dry foods contain ingredients that may irritate the gut lining and cause temporary inflammation (inflammation) which in turn results in loose stools. There are other causes too: Sometimes kitty simply eats something that disagrees with them — like chocolate — or they have an upset stomach such as vomiting or diarrhea caused by parasites (see “When does my kitten get worms?”).