Answer:
You seek me out when your hunger's ripe. I sit on four legs and smoke a pipe.
I think you live beneath a roof that is upheld by me; I think you seldom walk abroad but my fair form you see; I close you in on every side you very dwelling pave and probably I'll go with you At last into the grave.
The more you work the more I'll eat.You keep me full I'll keep you neat.
I go through a door but never go in and never come out.
By myself, I'm practically nothing. Worthless as a leader, but when I follow a group, their strength increases tenfold. What am I?
When is it bad luck to see a black cat?