Purina Pro Plan Veterinary Diets OM Overweight Management Canine Formulas have been specially formulated to help dogs lose weight while maintaining muscle. The science behind our therapeutic diets represents a collaboration between Purina pet nutrition experts, researchers and veterinarians. Medical Indications: Diets with these nutritional modifications have been recommended for dogs with the following conditions: • Obesity (weight loss and weight maintenance) • Constipation • Fiber responsive colitis • Diabetes mellitus in overweight dogs • Hyperlipidemia in overweight dogs