Answer:
Iron roof, glass walls, I burn and burn but never fall. What am I?
I don't live within a house nor do I live without. Most will use me when they come in and again when they go out.
I have roots nobody sees. I am taller than trees. Up up I go but I never grow.
I fill a room but take no space.
I love to twist and dance. Though wingless I fly high up into the sky.
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