Answer:
I can swim but never get wet. I can run but never get tired. I follow you everywhere but never say a word.
What is made of wood, but can't be sawed?
What has one head one foot and four legs?
In many hall ways you would stand if not with me in hand.
I widen my jaws when you poke two fingers in me. I especially like to devour papers
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.