Feed your dog's true instincts with Purina ONE True Instinct With Real Salmon and Tuna Formula Natural With Added Vitamins, Minerals and Nutrients dry dog food. Real salmon is the number 1 ingredient in this adult dog food, which includes real tuna in every serving. With 100 percent nutrition for adult dogs and 0 percent fillers, every high-quality ingredient has a purpose. This nutrient-dense formula contains 30 percent protein to support strong muscles, plus natural sources of glucosamine for dogs to support dog joint health. Together, they help craft a complete and balanced dog food full of the wholesome goodness your adult dog needs to keep up with his active lifestyle. Omega-6 fatty acids in this high protein dry dog food also support his healthy skin and a radiant coat. Purina ONE crafts wholesome dog food with no artificial flavors or preservatives.