Veterinarians recommend IAMS. Every life stage for your dog is unique, and IAMS understands what is essential to your senior dog. This IAMS Proactive Health dog food, Healthy Aging Dry Dog Food With Real Chicken, is made with real chicken as the #1 ingredient and contains no fillers or artificial flavors; ingredients are natural as defined by the Association of American Feed Control Officials (AAFCO). This dry dog recipe is scientifically designed to support five key areas of your dog’s health, keeping them full of life, for more life. IAMS Healthy Aging Dog Food is formulated with a carefully selected blend of natural fiber and prebiotics to support healthy digestion. As a natural dog food, it also contains an antioxidant blend that includes Vitamin E and Beta Carotene, which helps boost your older dog's immune response to healthy adult levels