Purina ONE True Instinct High-Protein Real Chicken and Duck with Vitamins Dry Dog Food is a grain-free, protein-rich formula features real chicken as the #1 ingredient along with real duck, packing 32% protein to help maintain strong muscles and a healthy heart. Infused with nutrient-dense raw bites and natural ingredients, it also includes glucosamine for joint support and four antioxidant sources for immune health, all with no poultry by-product meal or artificial preservatives. Available in Multiple Sizes