Deer often stamp their front feet when alarmed to alert other deer of danger. The foot stomp may also be used to try to startle a predator and causing it to move or the deer to assess the object. The excess interdigital scent left on the ground during the foot stomp may also tell other deer that a deer felt endangered in the area where the scent was left
Thank you skeeter for correcting that for me, i think hoopy might be a little on the touch side!
