Our Duck Formula provides complete protein, Omega-3 fatty acids, and essential vitamins and minerals for a healthy and wholesome diet. It is a limited ingredient, single protein formula that is balanced with fruits and vegetables to provide powerful antioxidants, dietary fiber, and low glycemic carbohydrates. Our Duck Formula is also grain free and chicken free, perfect for those canines that have food sensitivities or allergies. Not to mention it tastes great, builds lean muscle mass, and promotes healthy hearts. Zignature® Duck Formula – Learned from Nature, Crafted to Perfection.