I have THREE and they usually go outside, but I do keep pee pads down when we are not there, just in case.... & I keep 3 down. One by the back door, one by the door to the garage, and one in a place that seems to be their favorite.... near the hallway (must be a privacy issue
). They don't always get used, but sometimes Seeger just can't wait for me to get in the door and he will use it just as I walk in... the little stinker!