Fun Riddles

Question:

Sad, sick, or sloppy I'll help you out,
Use me right and I'll cover your snout.

What am I?

Question:

The dirtier I am, the whiter I get,
Leave a mark on me when you stand, I'll leave a mark on you when you sit.

What am I?

Question:

What is the most common use of cowhides?

Question:

Take me for a spin and I'll make you cool,
but use me when it's cool and you're a fool.

What am I?

Question: You are my brother, but I am not your brother. Who am I?