That is because wolves are pack animals. Teamwork is a specialty of theirs.
=:-)
Both man and canids were cursorial hunters. The teamwork between men devising the hunting strategy, with their faster compatriots implementing encirclement of large prey, brought greater success. The tamed wolves faced less risk avoiding a direct take-down of aggressive game, and men found more opportunity to use larger weaponry suited to prey size. Thus, a natural synergy developed between the two species, both which practiced pack hunting.