Answer:
My teeth are sharp, my back is straight, to cut things up it is my fate.
A device for finding furniture in the dark.
When they are caught, they are thrown away. When they escape, you itch all day.
I am whole but incomplete. I have no eyes, yet I see. You can see, and see right through me. My largest part is one fourth of what I once was.
What has one eye but cannot see?
I have two eyes in the front and a lot of eyes on my tail