Answer:
What is it that has four legs, one head, and a foot?
I have three hundred cattle, with a single nose cord
What can be heard and caught but never seen?
What makes a loud noise when changing its jacket, becomes larger but weighs less?
Where do you go in through one hole and come out through two holes at the same time?
Black we are and much admired. Many seek us if they are tired. We tire the horse, and comfort man, and turn White when we've fulfilled your plan.