Fiber-responsive conditions like colitis and diabetes mellitus can be uncomfortable for your pet—and for you. But with a diet containing an optimal fiber level, nutritional management can help. Purina Pro Plan Veterinary Diets EN Gastroenteric Fiber Balance Canine Formula contains a blend of soluble and insoluble fiber chosen by nutrition experts that helps normalize intestinal transit time. Insoluble fiber also helps promote greater water absorption. And for dogs with diabetes mellitus, this diet also contains complex carbohydrates to help reduce fluctuations in blood glucose.