Senior recipes are designed for dogs over 7 years old. A diet suitable for senior dogs is designed to help support their joints, higher in fiber to help "stay lean" and lower in energy to prevent weight gain at this golden age. A smart blend of glucosamine, chondroitin and MSM helps maintain cartilage for healthy joints. These recipes include L-Carnitine, an essential amino acid that helps maintain weight and muscle mass by burning fat.