This product worked wonders within minutes. I tested the vibrations on myself prior to using it on my dog to see what it would feel like. After placing the collar on my dog, he parked a few times, and was given a beep and vibration which made him stop barking. He has barked a significantly less amount since having the collar. I did have to lower the sensitivity because at one point, he swallowed which set off the collar. But a low sensitivity seems to work well.