Are Ultrasonic Dog Repellers Effective

Yes, ultrasonic dog repellers are effective. They work by tuning the sound waves to frequencies above 50,000 Hz. Dogs have much stronger hearing than humans, so these high-frequency sound waves are inaudible to humans and therefore harmless. However, for a dog, it's like hearing a loud truck horn blaring in its ear; the irritation will cause it to run away. Therefore, ultrasonic dog repellers are effective.