Answer:
I am the noise Santa's reindeers make
I have a straight back and sharp teeth to cut objects.
You find me behind the stars; or in a sixth seventh or third. It takes something round a computer and me to make pie. I am bigger than anything you can think of.
I get thrown in the air and will fall down. I get thrown down and I will rise in the air. What am I?
I let water fall on you while everyone else stays dry.
A little house full of meat, no door to go in and eat.