Vetsupply: Hill\'s Science Diet Adult 7+ Chicken Meal, Barley & Brown Rice Recipe Senior Dry Dog Food is specially formulated for mature adults starting to enter the golden years. Mature adult dogs require additional amount of nutrition for overall health. This 7+ Senior Dry diet is the best option for mature dogs. This clinically proven formula is loaded with various natural ingredients to suffice the various nutritional requirements of mature adult dogs.