Thread: Cat Door?

How about a bit of firm training to stop the dog going into the basement?
We sometime have doggie visitors in our house, and we don't allow dogs into the cellar where our cat litter trays are.
If you are very clear about which areas of the house the dog is allowed to use, and which are out of bounds, they soon get the idea.
Perhaps you could have another temporary litter tray elsewhere in the house as well, until your cats get used to having the dog around.