Kaopectate has indeed been used for many years in the past for puppies but has been re-formulated and should no longer be used in cats and dogs....
WARNING: NEW KAOPECTATE FORMULA UNSAFE FOR DOGS AND CATS
From Veterinary medicine Bulletin #4544.1: Those of you who use Kaopectate to control diarrhea, especially in cats, need to be aware of the recent formula change. Due to concerns regarding lead levels in the old formulation the manufacturer of Kaopectate have changed the active ingredient to bismuth subsalicylate. Salicylates (e.g. aspirin, Pepto Bismol and now Kaopectate) should only be administered to cats under veterinary supervision. Some dogs are also sensitive to salicylates. It is no longer safe to use Kaopectate for dogs or for cats at home. For more, go to:
www.usp.org/reporting/prnews/dsw - J. Martin DVM