PURINA® PRO PLAN® DOG Medium Puppy with OPTISTART® is the perfect food for medium-sized puppies and gestating or lactating mothers. Our recipe is tailored to support puppies' developing immune systems, natural defences, and long-term health, while also helping to support healthy joints and dental care. Rich in chicken and specially formulated by PURINA® expert vets and nutritionists, it contains colostrum, found in mother's first milk, to help your puppy grow into a happy, healthy adult.