NutriSource Large Breed Dry Puppy Food NutriSource(R) Large Breed Puppy Chicken and Rice Formula is a scientifically formulated, easy to digest food, specially designed for puppies of breeds that will mature at more than 50 pounds. It provides superior nutrition for balanced muscular and skeletal growth in large and giant breeds to avoid joint problems later in life. NutriSource(R) Large Breed Puppy contains specially adjusted levels of calcium and phosphorus matched with balanced protein, fat, carbohydrates and calories to supply large breed puppies the nutrition to grow and develop to fullest potential. Feed NutriSource(R) Large Breed Puppy food to your Large/Giant Breed Puppy from weaning until your dog reaches it's mature weight and size, typically at about 18 months of age. At maturity, we suggest transition to NutriSource(R) Adult or NutriSource(R) Large Breed Adult food.