Hill's Science Diet Adult Large Breed Dry Dog Food Bag. Natural sources of glucosamine & chondroitin for joints & mobility. Natural ingredients plus vitamins, minerals and amino acids. Clinically proven antioxidant benefits. No artificial colors, flavors, or preservatives. Science Diet is available in a variety of dry, canned and treats. At 7 years of age, transition your dog to a Science Diet Large Breed Adult 7+ food, over 7-10 days.