Supervise the dog? Close the door?
A babygate across the door so the cat can get in but the dog can't. Alteratively, confine the dog when he can't be supervised.I wish we could just close their door- this would solve so many problems. We can't close the door because they keep their cat's food and litter box up there, and the cat needs to be able to go in-and-out. And there isn't always someone home to watch him. He also seems to usually do it in the middle of the day when there are people home.