Large breed dogs become seniors sooner compared to their smaller-sized counterparts. By age 5, giant breed dogs are seniors; large breeds are seniors by age 6. They have special nutritional needs, owing to their size as well as life stage. Eukanuba recognizes this and has formulated Eukanuba Large Breed Senior Adult with L-Carnitine to help your dog naturally burn fat instead of storing it, to help control weight to minimize joint stress and natural sources of Glucosamine and Chondroitin Sulfate to support joint health. Eukanuba Large Breed Senior also contains two powerful antioxidants, Vitamin E and Beta-Carotene, to help support the strength of your senior dog's immune system. Eukanuba Large Breed Senior also contains our exclusive formulation of fiber, beet pulp and FOS (fructooligosaccharides), to support a healthy intestinal environment for the senior dog's digestive system.