China doll, I too have the same problem with 2 of my 12 furkids running outside when they get a chance. Of all the things I have tried, that a squirt bottle with water does the best job of keeping them inside. As soon as you open the door, have your squirt bottle ready and enter squirting water in the opening of the door. I have generally found that cats do not know when they are disobeying you especially if an opportunity presents itself to them. Therefore, they need reminding every so often with a squirt bottle.

................wayne