While not FDA-approved for pet use, Imodium is safe for dogs, according to PetMD. It can be used to treat mild diarrhea and inflammatory bowel symptoms in dogs, says PetEducation.com.
The active ingredient in Imodium is called loperamide, which slows down the digestive process and allows for an increase in the body's absorption of water, as PetMD states. This increased water absorption will reduce the remaining fluid in the stool and eliminate diarrhea symptoms. A typical dosage for dogs should be between 0.05 and 0.1 milligrams per pound given orally every eight hours. If the symptoms do not subside within 48 hours, it is best to contact your veterinarian for more information. While Imodium is perfectly safe for dogs, it is not safe and can cause severe side affects in cats.