Large-breed dogs can be prone to joint issues. Hill's Science Diet Healthy Mobility Large Breed dry dog food contains advanced nutrition shown to support healthy joints & improve mobility in 30 days. Using natural sources of glucosamine & chondroitin – the building blocks of healthy cartilage – this adult dog food supports the joints, while a balanced set of minerals promote strong bones. High-quality protein & natural fibers keep your large dog satisfied between meals. Made with natural ingredients, it contains omega-6 fatty acids and vitamin E to nourish the skin and help keep a shiny coat.