A spate of wild dog attacks draws Sam and Dean's attention. Sam and Dean suspect that it has something to do with a werewolf. They visit Madison, a friend of one of the victims thinking she may be the next victim.
Before the night of the full moon, prostitutes are being bitten to death by wild dogs, but this time a male lawyer was killed. Sam and Dean think that it may be connected to the werewolf legends and visit the victim's subordinate, Madison. Madison takes the place of Sam's now dead girlfriend in his heart and he decides to protect her, but she has a horrible secret.—theTVDB