Okay I don't if anyone has seen the new Citronella collars that are avaliable but they aren't dog activated, they're human activated. What they are, are the regular collar with the box to put the citronella in and then it comes with a remote control that has 3 buttons on it. The first button activates a beeping sound that can be used for a reward like a clicker or some people use it as a warning if the dog doesn't stop what it is doing after the beep they get sprayed, the next button lets a small spray out and the third button a longer spray. I don't have one myself but I do know of some people who do and they use it for various reasons, not just barking. Draw back of course is that while it is one the dog you'd have to monitor them so you can activate the collar but that shouldn't be a problem because you should be monitoring your dog anyways when they have something like that on.