Creatures with power less than Wandering Wolf's power can't block it.
Humans still feared wolves, though no connection between them and the curse of lycanthropy had ever been proved.
Official Rulings for Wandering Wolf
5/1/2012 : The comparison of power is only done when blockers are declared. Increasing the power of a blocking creature (or decreasing the power of Wandering Wolf) after this point won't cause any creature to stop blocking or become unblocked.