Logan started with just one, when his city ID tag went on he thought it was very entertaining also. All my dogs always have, but they do get used to it. Also it's a great alarm, you learn to hear where they are and whether they should be there or not. And mine do were them even inside, I'd never want to risk not being to grab a handle to get them out of a dangerous situation. I've had the occaisional accident if more than one is fighting but I've never had one get hung up. I know others have, so I keep Logans loose enough that he can get out of it in a split second. In fact, he can shake or wrestle it of his head pretty easy.