The Nature’s Own Beef Buffet consists of a mix of bully bites, tripe, beef lung, tendon mix chews originate from Brazil and are chosen from facilities that far exceed those of the pet food industry. In fact, many of the facilities we choose also produce food for human consumption. The beef comes from free range cattle. They are allowed to mature naturally. Raising cattle this way provides for lower fat and calorie beef that also demonstrates a higher amount of omega 3 fat.