Our Catfish Formula is naturally high in protein, healthy fats, and muscle-building amino acids. It is also grain-free and chicken free, which can be beneficial for dogs with food sensitivities. The high protein formula is closer to nature than foods that contain starches and carbohydrates, making our Catfish Formula a good way to maintain lean muscle mass. It also has a great taste that your dog will love. Zignature® Catfish Formula – Learned from Nature, Crafted to Perfection.