Cat Door #2

Herc is an old pro when it comes to cat doors.At our first house in Iowa, we put in a cat door so the kitties could come in out of the cold when they needed (or drag in dead rabbits, but that's another story) without us having to open and close the door. Now, they make their home in the garage, sleeping on the warm boiler system and eating at their leisure. The problem is, while we were leaving the garage door cracked, an extreme cold snap resulted in us coming home from our Christmas travels...