In truth, the alpha can be male or female, and then their mate is considered the alpha as well. Yes, we generally think that males would be the alpha, but in the wild and in wild preserves it isn't the case. There was a special on Animal Planet called "Growing up wolf" The alpha was a female called Rosolin and the leader of the pack. So really, testosterone doesn't really matter. Adrenilin, as someone said before, plays a part. Wolves tend to have have a higher adrenilin output than dogs and higher brain develpement. That is why wolves are interesting to me, because they are so much like humans.
Adrenilin is the key here. Women also have a higher production of adrenilin than men, giving them a higher threshold of pain and a much higher endurance than men. It's pure function is for child birth, but as we have heard or witnessed mothers can pick up large trucks and win marathons with men in them.
Side Note: I'd personally like to see one of the werewolves in the film pick up a car and throw it, even through it unlikely. But hey, Anthony does his own stunts! He'd be perfect for that kind of scene! Comeon, what do you say?