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.
how many letters are there in the alphabet
If you have it, you want to share it. If you share it, you don't have it.
What is it that has four legs, one head, and a foot?
When can someone truthfully tell someone βwell doneβ but think they did a bad job?
People take me on walks and I run and have fun. What am I?