Our beef chubs are single protein entrees. We only use USDA-certified, pasture-raised (grain finished), human-grade beef. Our ground bone comes from cuts of T-bone steaks and are a natural source of calcium and phosphorous for your dog. Our beef chubs include green tripe, which, along with many other benefits, is an amazing and highly bioavailable source of digestive enzymes and probiotics. Vegetables and small amounts of low-glycemic fruits are added to complete and balance meals. Beef heart and liver round out this amazing meal by providing essential vitamins and minerals (including iron, thiamin, Vitamins B6 and B12, and niacin).