Proper levels of protein, fat, calories and minerals will help your large breed puppy grow and thrive. Calcium and phosphorus provide ideal bone and joint development, and the addition of L-carnitine helps convert fat to energy and develop lean body condition and strong bones. Diamond Naturals Large Breed Lamb & Rice Puppy Formula Dry Dog Food also contains DHA for optimal brain and eye development correct balance of fat and proteinessential nutrientsCalcium and phosphorus