Hill's® Science Diet® Mature Adult Small & Toy Breed dog food provides precisely balanced nutrition to meet your small breed dog's special needs. It contains controlled levels of sodium and phosphorous to help maintain a healthy heart and kidneys, high levels of clinically proven antioxidants to help build a healthy immune system, and ideal levels of vital fatty acids to promote healthy skin, coat, ears and eyes. It also contains calcium and L-Carnitine, the key components for healthy bones and lean muscles to sustain mobility.