Use 1 tablespoon three times daily for large dogs or 1 teaspoon three times daily for small dogs, recommends Oxford Veterinary Hospital. Vet Info suggests dosing 1 milliliter of liquid Imodium per pound of body weight every eight hours.
For both medications, missed doses should be skipped, with the next dose given at the regular scheduled time, states PetMD. Additionally, caution should be used when Imodium is dosed in cats, pets with kidney or liver disease, pregnant or lactating pets, or elderly pets. Pepto-Bismol may be dangerous in cats and in pets with bleeding disorders. Pet owners should consult a veterinarian with any concerns regarding dosage or side effects.