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 has one eye but cannot see?
Large as a mountain, small as a pea, Endlessly swimming in a water-less sea.
Runs smoother than any rhyme, loves to fall but cannot climb.
My first is equality; my second is inferiority; my whole is superiority.
I have two bodies joined together as one. When standing still I run and run.