The Gentle Spray citronella bark collar arrived
today June 12 and my MIL and I put it on her dog straight away. It works worked great! The instructions say to put the collar on the dog, then put him in a situation where he normally barks. For Jonah, that means being put in his crate when Nancy leaves.
Update: Problem is, Jonah figured out that if he barks enough times, the nasty spritzy stuff runs out and he can then bark, yip and whine to his heart’s content. Dang it! Back to the old drawing board, $80 later.