Answer:
I am the noise Santa's reindeers make
Angels and pilots work with me.
When young I am sweet in the sun. When middle-aged I make you gay. When old I am valued more than ever.
I am black white and read all over.
I am as hard as metal, yet as flimsy as glass. I shine like a star, yet I am only a rock. What am I?
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