Nutrition for Dogs and Cats, PRO PAC® Ultimates™ is a fresh approach to nutrition. Made with the highest quality ingredients we can find. We start with real chicken, fish and lamb. We use dietary fats and fibers as well as a variety of wholesome fruits & vegetables. PRO PAC® Ultimates™ is also full of healthy amino acids, vitamins and minerals. Equally important, there’s never corn, wheat or soy fillers in PRO PAC® Ultimates™. There’s also no meat by-products and no artificial colors, flavors or preservatives.