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
Man walks over, and man swims under. In times of war, it can be burned asunder. What is it?
how many letters are there in the alphabet
Goes over all the hills and hollows. Bites hard, but never swallows.
A dagger thrust at my own heart, dictates the way I'm swayed. Left I stand, and right I yield, to the twisting of the blade.
What is yours but only used by others?