Here`s a tip to drag a deer. Those of you who know this will have to forgive me.
When you have gralloched your deer and before rigormortice sets in, cut a slit parallel with the leg bone and tendon where the layer of skin is above the heel on one of the back legs.
After cutting the slit which only needs to be about 3-4 inches long, depending on which type of deer it is, get the opposite back foot and feed it into the slit just to the back of the hoof and you will then have created a straight handle to pull the deer with. This is good for dragging reds as this stops the cramp in your hand.
Give it a try, i have done loads of deer this way and it works really well.