Eukanuba Adult Large Breed dry dog food provides complete & balanced nutrition for large breed dogs 15 months or older, weighing over 55 lbs. A combination of animal protein, chondroitin sulfate and 50% more glucosamine (vs. Eukanuba Adult Medium Breed dry dog food) helps promote lean muscle development and joint health in active adult dogs. DHA and vitamin E helps keep dogs sharp and supports healthy brain function. Optimal levels of fats and carbohydrates fuels an active lifestyle. High quality chicken is the first ingredient for protein that powers their day.