Professional+ Chicken & Lentils Formula for Senior Dogs is formulated to meet the nutritional levels established by the AAFCO Dog Food Nutrient Profiles for maintenance. This recipe is formulated to meet the needs of aging dogs. Cage-free chicken, the number one ingredient, provides high-quality, energy-rich protein. Added glucosamine and chondroitin help support aging joints, while probiotics and added fiber help support digestion, even in in the most sensitive senior dogs.