Dog Food for Medium-Breed Dogs (21 to 55 lbs.) from 12 Months to 7 Years of age. Once he has become an adult, frequent exercise and a diet maintaining strong natural defenses will keep the medium-size dog fit and healthy. Dogs need protection both inside and out. Antioxidant vitamins E and C, chelated minerals, and essential fatty acids from anchovy and soya oil help strengthen and protect the skin, intestinal tract and immune system of the medium adult dog. The combination of a moderate fat content (14%) and optimal protein content (26%) help to limit weight gain while maintaining your MEDIUM dogs muscle mass. High quality protein and carbohydrate sources, mannan-oligosaccharides, and beet pulp help to promote optimal digestion and nutrient absorption. Available in 6 lbs.