Diet
Like the immune systems, digestive systems in puppies are not fully developed. Therefore, they tend to have sensitive stomachs and might have difficulty digesting specific foods or ingredients. Most of them would also respond slowly to an abrupt change in the diet. Several food allergies can also be possible causes of diarrhea in puppies. Keep in mind to consult your vet to make sure the foods you choose can be a good option for your pet’s needs.
Another thing to know is that puppies can be curious about surrounding things and tend to ingest or mouth interesting objects. These would include garbage or string. Some items can be toxic and harmful, which can eventually lead to diarrhea and other serious issues. [2]
