Oh. My. God. Well, there you have it! Frozen bull penis. According to the Wikipedia entry on pizzle, "bull pizzles are almost exclusively used/produced today as chewing treats for dogs. The pizzles of bulls are cleaned, stretched, twisted and then dried at a very high heat. The result is a very hard, 80-100 cm long brown stick, which is then sawed into pieces appropriate for the size of the dog, usually 10-20 cm (this process also makes its anatomical origin rather unrecognizable)." Huh! Someone should probably amend that Wikipedia and talk about how...
