To use this Purina Pro Plan dog food, simply serve it to your dog according to the feeding guidelines on the bag. These guidelines are based on your dog's weight, age, and activity level. Make sure your dog has access to plenty of fresh water at all times. When introducing this new food, do it gradually over 7 - 10 days by mixing it with your dog's old food. This helps prevent digestive upset. Store the dog food in a cool, dry place. Once opened, keep the bag tightly sealed to maintain freshness. If you have any concerns about your dog's health or diet, it's always a good idea to consult your veterinarian.