The other day I noticed that our cat door was broken and letting in cold air–it’s winter here. So I removed the door and closed the window where it had been. The cats rapidly learned that they have to come to the back door or, if it’s late, to the bedroom window and meow for admittance. They aren’t going out much as long as it’s cold.
I need to sling the broken apparatus into the car so that I can see about getting a replacement with the minimum of new parts.