The dog is farting too much. This would likely be accompanied by a strong odor. Though the obvious cause is bacterial fermentation of the food, in dogs it could just be taking in too much air. Other causes could be diet changes, infections, inappropriate foods like milk, soya, peas, high fat or high fiber foods, eating habits like gobbling food. Other systemic diseases like that of digestive, circulatory and respiratory system could also cause flatulence.
