Answer:
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
What can you lose that will cause other people to lose theirs too?
I run up and down the stairs without moving
I am an object which is used in baseball during the day I can't be seen at all
I am black and white. I have strings I have keys. I make sound without my lips. I make dough with no flour
Break me and I am better immediately set and harder to be broken again.