I was being driven mad by my Maltese Shih Tzu barking at anything and everything in the “witching hour” - about 6 to 7 each evening. Even though I am averse to punitive training, desperation won out and I tried the Citronella collar. The first time he stopped barking because he was trying to get at the unfamiliar “thing” under his chin. The next time his puzzlement at the citronella spray was entertaining to watch. I have only put it on a few times since then, and it stops his barking every time. I do have to admit that the action of putting the collar on may be the reason for the cessation of barking. Who cares? The end result is what I wanted. Easy to put on and off as needed.