100% Beef Casings, Grain-Free and Gluten-Free Crude Protein 65.0%, Crude Fat 20.0%, Crude Ash 3.0%, Crude Fiber —%, Moisture 12.0% This crumbly treat always works well due to its strong smell and pungent taste. We recommend avoiding them when you have visitors; we find these rumen sticks smell a little less appetizing than the dogs'.