While watching some video's i found out a HINT to become a werewolf, when your doing the companion quest line you'll need to help a fellow companion but you'll end up in a trap of the enemy. Suddenly your fellow companion turns into a werewolf and kills everybody. Then he comes up to you and says "I hope that did not scare you". You will have the option to say are you going to turn me in to a werewolf then he says: No only the circle has the Wolf blood and that you'll need to IMPRESS the council of the companions before they'll give it to you.

