Answer:
I am black when I am clean and white when I am dirty?
My tongue hangs out as I run over fields and streets all day. I get tied up every morning and untied at night.
What can be filled with empty hands?
A device for finding furniture in the dark.
What is full of holes, but can still hold a lot of water?
A leathery snake, with a stinging bite. I'll stay coiled up, unless I must fight.