Purina PVD Dog Obesity Management is a complete veterinary diet with high protein level that is clinically proven to be effective for weight loss in obese dogs. Canine OM Obesity Management is a complete veterinary diet with high protein level that is clinically proven to be effective for weight loss in obese dogs. Dogs kept in shape and with a lean body condition can live longer than dogs overweight. High protein level to help promote body fat loss while maintaining lean muscle during weight loss. Low in calories: reduced fat levels to help reduce the number of calories consumed. Control of glucose: High in complex carbohydrates and fiber to help reduce blood sugar fluctuations throughout the day.