Nupro Joint Support is formulated for active or senior dogs with Glucosamine Complex, MSM and Ester-C. Your dog now has the benefit of a balanced combination of select ingredients formulated to support normal joint structure, function and flexibility as well as to promote optimal overall health. Nupro helps to maintain the health and resiliency of joints, muscles and connective tissues. The formula also helps to ease discomfort associated with normal daily exercise and active lifestyles. Nupro Joint & Immunity Support is not just for senior dogs or those with arthritis! The active athletes, show dogs, working dogs, police and search and rescue canines, sled dogs, hunting dogs, AND large breed dogs, as well, will profit from having glucosamine in their diet.