Answer:
I'm at the head of an elephant and at the tail of a squirrel
What has banks but no money a bed but no sleep waves but no ocean?
Soft hairy from door to door. I am the pet that always stays on the floor.
Everyone has me and no one can lose me. What am I?
Die without me, never thank me. Walk right through me, never feel me. What am I?
No matter how little or how much you use me, you change me every month.