Dog Whistle to Stop Barking and Dog Training Ultrasonic Pet Safe Pet Training Repellent Aid Train your dog to stop barking and follow simple commands. This dog barking whistle is compact, and lightweight, making it incredibly efficient and convenient. This is Pet Training Dog Adjustable UltraSonic Sound Whistle. Dog whistle with the dog to establish a good tool for communication and discipline. Great tool to have when you are training your dog.