This healthy weight dog food is specially formulated to help overweight or obese dogs lose weight while maintaining lean muscle. The science behind Purina^® Pro Plan^® Veterinary Diets represents a collaboration between Purina nutritionists, researchers, and veterinarians. Low in fat and calories, this Purina Pro Plan weight management dog food features a high protein-to-calorie ratio to promote the loss of body fat while helping maintain lean body mass. This low-fat dog food includes isoflavones to help reduce the risk of weight regain and fat accumulation, plus natural fiber for dogs to contribute to satiety after meals.