Do ultrasonic dog repellers work?

Ultrasonic dog repellers work. The human hearing range is 16-20000Hz, while the dog's hearing range is 15-50000Hz. The ultrasonic dog repellent uses 25,000 Hz, which is inaudible to human ears, to emit an instant strong "explosive" sound to stimulate the dog's hearing and nervous system, making the dog feel scared, thus playing the role of repelling the dog.

The sound of 25000Hz is inaudible to human ears and will not cause any trouble or irritation to people. Dogs can hear it, and it can effectively stimulate dogs. Instantaneous ultrasonic waves will not cause any harm to dogs. However, the use of dog repellers is based on distance. If it exceeds the effective range, it will not have any effect on the dog.