Pepto Bismol is generally safe for most dogs, but it can cause constipation, reports PetCareRX. Owners also need to adjust the dose for the dog's body weight to prevent accidental overdose.
Some dogs can also have an allergic reaction to Pepto Bismol, according to PetCareRX. Dogs that have a history of allergies to any of the ingredients should not take it, and its use is contraindicated for pregnant or nursing females and for dogs with bleeding disorders. It can interact with certain other medications that the dog may be taking. Collies are more likely to have a negative reaction to Pepto Bismol, so owners of that breed should consult their veterinarians before giving it, notes The Bark
Diarrhea can be a sign of serious problems, so owners should call their veterinarians for advice, reports PetCareRX. Most cases are mild, and an owner can treat the dog safely at home. An owner should take his dog to a veterinarian immediately if it seems lethargic, stops eating or vomits in addition to having diarrhea. The dog requires veterinarian examination if it struggles to defecate or if there is blood or mucous in the stool. Young puppies should generally see a veterinarian any time they suffer from serious diarrhea because they can become dehydrated and experience other complications more quickly than an adult.