Answer:
I am shared by goats devils and unicorns.
So cold damp and dark I am. To stay you would refrain yet those who occupy me do never complain.
What can be as big as an elephant but weighs nothing?
Of the king I am blue and of the peasant I am red. Of the frog I am cold and of the dog I am hot instead.
The more it dries, the wetter it becomes. What is it?
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