Answer:
What is black when it's clean and white when it's dirty?
I go inside boots and outside shoes.
Who keeps the ocean clean?
I am the noise Santa's reindeers make
I begin and have no end. Eventually, I will be the ending of all that has begun. 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