Contains essential nutrients also found in mother's milk. Build: Digestive System; Bone & 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 stays 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 - Conta