Thank you all for these posts and especially the Trainer for the first post here! I tried it and the bad dog doesn't bark as much and loves the kind "good girl" for barking and being quiet. It has quieted down and we slept through the night!
The funny thing was the quiet older dog barked with glee her whole body wagging. I then immediately praised her for the quiet and she was very happy. They love it and think it's a game.
