Compared to regular puppy food, small breed puppy formulas have: Smaller kibble size for tiny mouthsHigher protein levels to fuel their rapid growth, More calories and fat for the higher energy needs of small puppies, Tailored calcium and phosphorus levels to control bone growth, Certain nutrients to support brain development, Ingredients selected for easy digestion, Antioxidants for immune system support, So small breed puppy foods provide customized nutrition based on the unique needs of growing small pups.