| Just yelling at a barking dog is rarely successful at getting him to stop but our new Bark-Free Ultrasonic Trainer works like a charm! This simple device, developed by U.S. veterinary technicians, works indoors or out in a 25-foot range as an effective and humane way to stop a neighbor's dog or your own from barking incessantly.Bark-Free has a built-in microphone that senses constant barking and triggers an ultrasonic tone inaudible to humans to help cure this problem behavior. It stops emitting i |