one of Ollie's favorite treats are pizzle/bully sticks. I love them because it keeps him occupied when I can't give him my full attention (esp. when washing dishes/cooking) the swirly ones he can chew through fairly quickly, but these twisted ones take some time. we usually buy him the smaller 6" ones for small dogs, but they were out of them the last time we went to the store (calvin + Susie)...so we just bought the bigger ones. 12" stick. LOVE them. they last even longer, and we don't have to buy so much or as frequently!