Answer:
When I'm metal or wood, I help you get home. When I'm flesh and I'm blood. In the darkness I roam.
What kind of dog chases anything red?
What is green, has four legs, no tail, and usually heard at night?
What animal dwells in water and best known for its work ethic?
What goes in the water black and comes out red?
Almost everyone needs it, asks for it, gives it. But almost nobody takes it.