"I read all the reviews, and still decided to give it a try. I have 2 Aussies, and one does alert barking at night only. His alert barking continues for too long. I didn't want a collar that completely stopped the barking. When he starts his barking, I tell him quiet, if he doesnt' stop, I hit the button. He immediately stops. I praise him for stopping, and he then comes to me for his reward. I wait a second after I say quiet before I hit the button to give him the opportunity to stop on his own without having to be corrected. I need him to learn "quiet".
However ... this Aussie is a gentle soul. He is not hard headed. I think that is why this works on him. I can see why it doesn't work on yappers, or work on dogs who are seriously barking. First, the dog has to hear the tone, and second, if your dog is so intent on getting at something, or protecting, it's too focused on it's prey and won't pay attention to the tone."