Vulnerabilities of the Werewolf
Werewolves have several described weaknesses, the most common being an aversion to wolfsbane (a plant that supposedly sprouted from weeds watered by the drool of Cerberus while he was brought out of Hades by Heracles). Unlike vampires, werewolves are not harmed by religious artifacts such as crucifixes and holy water.
Various methods have existed for removing the werewolf form. The simplest method was the act of the enchanter (operating either on oneself or on a victim), and another was the removal of the animal belt or skin. To kneel in one spot for a hundred years, to be reproached with being a werewolf, to be struck three blows on the forehead with a knife, or to have at least three drops of blood drawn have also been mentioned as possible cures. Many European folk tales include throwing an iron object over or at the werewolf, to make it reveal its human form, naked in cases from 1859.
Another vulnerability is to use a weapon of pure silver (bullet, knife ect). To stab a werewolf with a silver dagger, or to shoot it with a silver bullet is said to not only kill a werewolf, but to also cause it agony in the time before it dies, rather resembling being slowly burned from the inside.
Becoming a werewolf simply by being bitten by another werewolf as a form of contagion is common in modern horror fiction, but this kind of transmission is rare in legend.