Just now as I was on my computer I heard it again. I grabbed my camera and followed Weasel as she raced down the steps into the basement, mouse in mouth. Of course she let it go.
I have read that to mouse-proof your house you must block every opening as big as the eraser on a pencil or they can get in. Even though we have weather-stripping on the bottom of our front door, there is still a tiny opening about the size of a pencil eraser where the doors meet, not to mention how frequently the doors are opened, letting cats and dogs (and possibly mice) in and out every day. However, I can rest easier knowing that any mouse that chooses to live in this house will not last long, thanks to Shamu and Orange, the real farm cats.