Answer:
Runs over fields and woods all day. Under the bed at night sits not alone, With long tongue hanging out, Resting at your feet until we go for a walk
What goes around and around the wood, but never goes into the wood?
It happens when something has been cut with H2O.
In marble halls as white as milk, lined with a skin as soft as silk. Within a fountain crystal-clear. A golden apple doth appear. No doors there are to this stronghold, yet thieves break in and steal the gold.
He has married many women, but has never been married. Who is he?
What is always coming but never arrives?