Deer have several uses for their antlers. During the mating season, a buck or bull deer uses his big antlers as a weapon to fight other males for leadership of the herd and to win mates.
Any predator (such as a wolf) that dares to attack a deer is also likely to be hurt by the sharp antlers.
Nearly all male deer have antlers. Female caribou and reindeer (cows) are the only female deer that grow antlers. During the long winter, when food is scarce, cows often use their antlers to push other cows away from the best feeding spots.–Dick Rogers