Officially, dog diarrhea is the “frequent evacuation of watery stools,” or according to the American Gastroenterology Association (AGA), “an increase in the frequency, fluidity, or volume of feces.”  Regardless of the terminology, dog diarrhea is the main sign of intestinal dysfunction, and it can be classified as acute (if it lasts less than 14 days) or chronic (if it lasts over 14 days).