Answer:
What loses its head in the morning but gets it back at night?
A dragons tooth in a mortals hand I kill I maim I divide the land.
What can be as big as an elephant but weighs nothing?
Brown I am and much admired; many horses have I tried; tire a horse and worry a man; tell me this riddle if you can.
I am a kind of coat that can only be put on when wet.
Give it food and it will live, give it water and it will die.