Draco predictably transitions from shifty character to outright supporting villain over the course of the Harry Potter series. One thing you might not have seen coming, though, is that hes a werewolf. Certain corners of the internet are convinced by this theory. Its known that the Malfoys failed Voldemort a few times (notably when Lucius failed to retrieve the prophecy about the Dark Lord's death during Order Of The Phoenix). Perhaps, as punishment, Voldemort sent his premiere moon-howler Fenrir Greyback after Draco. This could add further reasons for Dracos shaky and somewhat sickly demeanour during the next film, The Half-Blood Prince. Hes not just worrying about potentially killing Dumbledore, hes also concerned about turning into a giant hairy beast at any moment. When Draco intimidates Burgin by showing off something on his arm (during, again, Half-Blood Prince), the easy assumption is that he reveals the Dark Mark, the sign of Voldemorts supporters. This is never confirmed, though. It couldve been something else scary, instead like a werewolf bite. He even refers to Greyback both a Death Eater and a werewolf as a 'close personal friend' in the same scene. Rowling has refuted this one, but when has that ever stopped us believing?