Answer:
I am black of eye and bright of hair. I fast into the ground and follow my lord as he races around the world. What am I?
I have a straight back and sharp teeth to cut objects.
I have three eyes and only one leg. Obey me or you will be sorry.
In the sun I like to play; in the rain I goes away; walk or run I always follow; in the mud I always wallow.
Draw fire or fill me; I'm still empty.
As round as an apple. As deep as a cup. All the king's horses can't pull it up.