The Purina Pro Plan High Protein Large Breed Puppy Food With Probiotics, Beef & Rice Formula is a high-quality, complete and balanced diet that provides 100% of the daily nutritional requirements for your pet. The food is made with real beef as the number one ingredient, and it is also fortified with glucosamine to help support joint and cartilage development. The food is also rich in DHA to help support brain and vision development. The food is available in a convenient 18-pound bag.