I somehow knew this thing would not stop the neighbor's dog from barking. I looked at this unit on-line several times, and each time decided not to buy it. One day I must have had a weak moment with that dog barking and Barking and BARKING... So, I thought I would give it a shot. Alas, I put it within 30' of the dog, 6' high and in direct line of sight. The unit appears to be functioning and sending out it's signal. Even on the ultrasonic setting, there is a slight audible 'click.' However, it has no effect on the dog. The dog still barks and barks and barks... Maybe it would work for your dog, but it did not work for mine.