Imodium AD in liquid form is usually safe for dogs in doses of 1 ml per pound, according to Dose My Pet. But the website notes that dog owners should consult with a veterinarian when using liquid Imodium as it contains a small amount of alcohol that may be toxic.
Imodium is often prescribed by veterinarians to treat diarrhea in dogs. Caution should be used when administering this drug to older dogs, notes Dose My Pet. It should not be used in cases in which diarrhea is caused by bacteria or an ingested toxin or in conjunction with benzodiazepines or sedatives. Dogs should not be treated with Imodium for longer than two days.