Some pets will have a moderate increase in stool. Our formula adds quality fibers for specific dietary health benefits. The stool volume initially varies by a pet, due to the overall condition of the gut, including factors like stress, the current health of the animal, etc. When changing your pet’s diet, you may observe a slightly larger stool volume for the initial transition period. This is normal and your pet will adapt after a short period. If you see a significant change in stool volume during the transition period, it is best to take a slower approach to changing your pet’s food, to allow their digestive system more time to adjust to the new diet by slowing the transition amounts of old food to new food.