Answer:
It doesn't live within a house, nor does it live without. Most will use it when they come in, and again when they go out.
I have one, you have one. If you remove the first letter, a bit remains. If you remove the second, bit still remains. If you remove the third, it still remains.
When they are caught, they are thrown away. When they escape, you itch all day.
Although I'm not an insect, some people found me very difficult to exterminate. They called me something like 'insane priest.' The first half of my name means the same as 'scrape,' & my last three letters are a metal. Who am I?
What can be swallowed, but can swallow you?
People take me on walks and I run and have fun. What am I?
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?