Whether they're working or competing, hunting or herding, every active dog faces unique challenges. Help him meet those challenges with targeted nutrition from the Pro Plan SPORT line. Concentrated nutrition helps optimize oxygen metabolism for increased endurance. Amino acids help nourish muscles, including the crucial time immediately following exercise. Feeding Guidelines: 3-12 lbs ; 1/2 - 1 cup13-20 lbs ; 1 - 1-1/3 cups21-35 lbs ; 1-1/3 - 2 cups36-50 lbs ; 2 - 2-1/2 cups51-75 lbs ; 2-1/2 - 3-1/3 cups76-100 lbs ; 3-1/3 - 4 cupsOver 100 lbs ; 3-2/3 cups plus 1/3 cup for each 10 lbs of body weight over 100 lbs. Making the Switch to Pro Plan: Although you'll be anxious to see the difference Pro Plan can make in your dog, please allow 7-10 days to ease the transition from your dog's current food. Each day, simply feed a little less of the previous food and a little more Pro Plan until you're feeding Pro Plan exclusively. This gradual transition will help avoid dietary upsets. Provide adequate fresh water in a clean container daily. For your pet's health, see your veterinarian regularly. | Purina Pro Plan Performance 30/20 for Canine Athletes Chicken and Rice Formula, All Ages Dry Dog Food | Size 37.5 lbs