Answer:
Canine children.
Many people own a copy of me. Without me the world would fall.
When it comes to me you go on red and stop on green.
The dirtier I get, the whiter I am. What am I?
I am constantly overlooked by everyone but everyone has me.
What language does a billboard speak?
What am I?
Animal
Difficult
Easy
Food
Funny
Kids
Logic