Hill's Science plan Large Breed Puppy food with Chicken is specially made with an optimal level of calcium for controlled bone growth, a unique developmental need of large breed puppies. Give them the best start in life so they can grow to their full potential. It contains balanced minerals for strong bones & teeth, DHA from fish oil for healthy brain & eye development and high-quality protein for building lean muscles. Recommended for Large breed puppies (over 25kg when adult) up to 18 months old. Not recommended for adult or mature dogs.