Bison is an excellent meat for dogss due to its high protein level and low fat content. Our Bison Lover Bits are a combination of Bison Liver and Bison Heart. Our Bison come from free-ranging herds in the United States and Canada without added hormones, steroids or antibiotics. We add a small amount of mixed tocopherols, an organic preservative, to prolong the shelf life of this treat. Dogs just love this delicious treat. Proudly made in our bakery from "scracth," in Boulder, Colorado in the USA. Ingredients: Bison, mixed tocopherols (an organic preservative).