Answer:
Before Mt. Everest was discovered what was the highest mountain in the world?
Soft hairy from door to door. I am the pet that always stays on the floor.
I always have to work with something in my eye. What am I?
I can sizzle like bacon. I am made from 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.
My second is performed by my first. A thief by the marks of my whole might be caught. What am I?
No matter how little or how much you use me, you change me every month.