Complete nutrition formula. Build: Digestive system; Bones & joints; Healthy immune system. Replenish: Vital organs including a healthy heart. Repair: Muscle cells. 100% Complete & balanced nutrition that builds, replenishes & repairs every day. Your puppy isn't just growing. He's also depleting energy stores and causing wear and tear on muscles and joints just by being playful. The fact is, from the moment he's born and throughout his lifetime, his body is building, replenishing, and repairing itself 24 hours a day, 7 days a week. That's why we created the Purina Puppy Chow Build Replenish Repair Philosophy - To provide your puppy with the smart nutrition he needs to optimize this ongoing lifelong process, so he stay vigorously healthy now and as an adult. Build: Digestive System - Provides a well-balanced diet including amino acids and electrolytes to help a puppy's intestinal cells develop, so he can absorb the nutrients he needs; Bones & Joints - Contains a complex spectrum of essential nutrients needed for a puppy's proper growth, including the development of healthy bones and joints; Healthy Immune System - Formulated with high-quality protein and a special antioxidant blend to help build and support a healthy immune system. Replenish: Vital Organs Including a Healthy Heart - Contains all the nutrients needed to replenish and support vital organs, including a healthy heart. Repair: Muscle Cells - Provides the amino acids and mineral needed to support a puppy's natural ability to repair and maintain healthy muscle cells. Purina Puppy Chow Complete Nutrition Formula: Puppy's grow and develop at a rapid rate, so they need up to twice the nutrition of adult dogs. That's why Purina Puppy Chow Complete Nutrition Formula is specially formulated with the extra nutrition your puppy needs for proper growth and development. High-quality ingredients come together in a complete and balanced diet that helps build, replenish and repair your puppy's body non-stop. 100% Complete and balanced nutrition for your puppy's first year, up to two years for large breeds. High-quality protein, including protein from egg, promotes overall proper development. Great taste encourages a healthy appetite. Animal feeding tests using Association of American Feed Control Official (AAFCO) procedures substantiate that Purina Puppy Chow provides complete and balanced nutrition for all life stages. Recommended by Veterinarians: Veterinarians recommend Purina Puppy Chow brand puppy food to give puppies the complete and balanced nutrition needed for proper growth and development.