Bully sticks are long-lasting chews for dogs made of beef muscle; specifically beef pizzle. They are usually single-ingredient or limited ingredient chew treats made from steer or bull penis, and they come in dried, cooked or raw forms. Bully sticks for dogs come in various shapes including braid, ring, twist and bone shapes. Dog bully sticks may also be flavored to taste like poultry, fruit, cheese or other canine-friendly snacks.