Zignature’s Salmon Formula is loaded with heart-healthy Omega-3 fatty acids. Salmon is also packed with lean protein for building lean muscle mass and maintaining strong bones. Zignature’s Salmon Formula is completely grain-free, and that can help with dogs that have food sensitivities. It also includes plenty of antioxidants and low glycemic carbohydrates for a healthy, satisfied dog. Zignature® Salmon Formula – Learned from Nature, Crafted to Perfection.