Answer:
I go in hard come out soft. Blow me hard and I’ll make a pop.
What has an eye but cannot see?
I'm the source of all emotion but I'm caged in a white prison.
I dig out tiny caves and store gold and silver in them. I also build bridges of silver and make crowns of gold. Sooner or later everybody needs my help yet many people are afraid to let me help them.
While you were folding a letter you got me. Usually you will do whatever it takes to avoid me but now you can't help but find me.
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