Answer:
It's been around for millions of years but is never more than a month old. What is it?
What goes through a door but never goes in and never comes out?
You can always find me in the past. I am created in the present, but the future can not change me. What am I?
Draw fire or fill me; I'm still empty.
I mirror your actions.
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