Puppies go through a lot of big changes. Your medium-sized puppy requires the correct nutrients and an adequate amount of calories during their rapid growth period. Your puppy's bones, muscles, senses, and nervous system are still growing during this period. Additionally, your puppy needs the best protein to develop their own immune system during this time because it is when the antibodies from their mother's colostrum begin to wane. The purpose of ROYAL CANIN® Medium Puppy is to provide medium-sized puppies with the nutritional support they require. Puppies aged two to twelve months can use this formula to grow to an adult weight of eleven to twenty-five kilograms. With their developing immune systems, the nutrients in this formula, like vitamins C and E, help support the puppies' natural defenses. It is enhanced.