Well, we adopted the dog, in the end. She is absolutely lovely in every way, and very well trained, but she woofs whenever my neighbours leave: as they work shifts, this is in the middle of the night. Another neighbour told me she had used one of these thingies that goes in the kitchen, apparently it emits a high-pitched noise that only the dog can hear whenever it barks, so that it learns to stop barking.
First of all, is this cruel? And does it work?