Answer:
What has a head, a tail, is brown, and has no legs?
I can sizzle like bacon, I am made with an egg. I have plenty of backbone, but lack a good leg. I peel layers like onions, but still remain whole. I can be long, like a flagpole, yet fit in a hole.
How far will a blind dog walk into a forest?
What kind of room has no windows or doors?
I'm not man's best friend, I'm their enemy, I can mark your end, yet you do not see me, I am very small, but very tough, If you have me, then you have it rough.
You use it between your head and your toes, the more it works the thinner it grows.