We have a Chihuahua-Weenie who is anxious and barks at lever little sound that happens in or around the house. That, in turn, keys the other dogs up to start barking, too. This device stopped the "followers" from barking, and now I think the leader of the bark pack doesn't think it's as fun to bark alone. Instead, it distracts him enough that I can call him over to me and comfort him. Good purchase.