Most people can forgive the occasional bark. But when the dog next door goes off like a car alarm at 2 a.m.—every night—it becomes exhausting. If you're staring at the ceiling at 4 a.m., wondering if ...

I get a steady stream of emails from people whose dogs have become anxious, reactive, or simply different since an ultrasonic bark deterrent entered the house. I wrote about these devices years ago. I ...