Answer:
I love to dance and twist and prance. I shake my tail, as away I sail. Wingless I fly into the sky.
Round as a button, deep as a well. If you want me to talk, you must first pull my tail.
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
It holds most knowledge that has ever been said. But is not the brain, is not the head. To feathers and their masters, it's both bane and boonΒ One empty, and one full.
Only one color, but not one size. Stuck at the bottom, yet easily flies. Present in sun, but not in rain. Doing no harm, and feeling no pain.
You use it between your head and your toes, the more it works the thinner it grows.