I have 3 dogs and the smallest one is their loudest leader. This collar has cut down on the barking only because I have THAT neighbor that likes to call the police when my dogs bark so we had to figure out something. He knows when its not on him that he is free to bark so it has to be on him. It has cut down on the barking but now my other 2 seem to speak up more...guess I need 2 more!