Zignature Tukey Formula for dogs is a meat first, limited ingredient recipe that is naturally high in protein and Omega-3 fatty acids. Turkey - the all-American classic and perfect alternative to chicken. Zignature Turkey Formula is made with high-quality turkey first that offers a lean protein source that's low in fat and high in vitamins & minerals. It's also rich in riboflavin to help the body absorb nutrients and includes selenium, a powerful antioxidant.