The treatment for cats with mild diarrhea (if they are not dehydrated or show other symptoms) is as follows:
First add a teaspoon of plain yogurt to your cat's food or let her lick it off the spoon. If that has not helped the diarrhea within 24 hours, go on to the next step.
Withhold food for 24 hours. Then feed a bland diet such as boiled rice with cooked lean hamburger or chicken, cottage cheese or yogurt. Use mall feedings a few times a day for two or three days.
If your cat still has diarrhea after 3 days, it is strongly recommended that you consult a veterinary. While most cases of temporary diarrhea are a simple case of a “bug”, in some cases it is the sign of a serious underlying cause and a visit to the vet can save your cat’s life.