Answer:
Soft, hairy, from door to door. I am the pet that always stays on the floor. What am I?
When young, I am sweet in the sun. When middle-aged, I make you gay. When old, I am valued more than ever. What am I?
I go in hard come out soft. Blow me hard and I’ll make a pop.
I am a fruit with seed on the outside.
I break down buildings, I crumble mountains but you can't see me. What am I?
No matter how little or how much you use me, you change me every month.