Our OPTISTART range was inspired by our discovery of how to support your puppy’s immune response by up to 50% more*. As puppies discover outside world and new environments, OPTISTART products help to maintain their strong natural defense and long-term health thanks to colostrum - a nutrient found in mother's first milk. This specific ingredient is proven to reduce the risk of upsets and helps to stabilize intestinal microflora during stress episodes. PURINA PRO PLAN Large Robust Puppy with OPTISTART has been created for Large breed puppies (>25kg adult weight) and specially tailored for the higher body fat mass and lower energy requirements of Large Robust dogs. With a combination of key nutrients - such as omega 3 fatty acids, high protein levels, appropriate Ca/P ratio - this diet helps to support healthy joints for puppies’ active lifestyle. Rich in high-quality chicken, it offers optimal nutrition to power your Large puppy growth up to 24 months of age when they will mature to Adult.