This weight management and mobility support dog food was created with Hills unique understanding of the biology of overweight dogs. It provides lean muscle support, and also uses clinically proven antioxidants for a healthy immune system. Over 70% of dogs lost weight within 10 weeks (USA Study). With added fish oil to provide EPA, an Omega-3, to help support joint health for a mobile & active life. Feed this breakthrough nutrition for your large dogs healthy weight maintenance and joint health. and now it comes in a larger kibble for large breed dogs. Feed this breakthrough nutrition for your large breed dogs healthy weight maintenance, long-lasting weight support and joint health.