Pro Plan Puppy Large Athletic Chicken. Complete Pet Food for Large Size Puppies with an Athletic Physique. Also Suitable for Gestating/Lactating Bitches. At Pro Plan we believe that, for a lasting difference in your dogs health, leading-edge science needs to be expertly applied to the nutrition that accompanies your dog throughout his life. Thats why our team of pet nutritionists, together with expert veterinarians, have developed for Purina Pro Plan, Optistart#, formulated with a blend of ingredients including colostrum, to help protect your puppy by helping to support a healthy immune system. Carbohydrates: for energy and good digestion. Fat: for skin, coat and overall vitality. Vitamins and Minerals: to help maintain healthy bones and teeth and help support natural defences. Protein: for muscle mass and vital organs, A specific blend of nutrients that helps support Puppys immune response and helps to maintain strong natural defences. A combination of key nutrients that helps to support healthy joints fo