I bought this product for my nosey mini pin 2 year old. once he started barking too much we put it on him and he felt the vibrations which surprised him. it is also loud enough for you to hear it which is cool. the only problem or caution I would say to look out for is to make sure it fits perfectly and tight to wear so it doesn't move when your dog moves. if it moves it kind of defeats the purpose. but other than that I would recommend!

The collar has some pretty big (1") sensor probes that look not so comfortable on the neck, probably necessary for the deterrent. The on/off is pretty sensitive to get it on, you need a dime or something to turn on/off which is good so when the dog wears it the normal movements won't accidentally turn it off. That being said, it is necessary to move it around to the exact position and confirm green light that it is on. You can't just turn it to the word ON, it may need to be ever so slightly adjusted a fraction one way or the other to make sure it is on. Our particular experience seemed to work well on our dog, it only took a couple of times of it vibrating to startle our dog and get her to realize that it was because she barked. It didn't seem to vibrate on growling only barking and we had it pretty tight and her hair is short. It would not be something you would want to leave on your dog forever because I am sure the probes in the neck are not so comfortable for the dog. Overall my dog has reduced her barking about 90% even without the collar on. If she has a particular barking episode on our lanai we put the collar back on for a while and she figures it out. She does seem pretty sad with it on but she is learning quickly and hopefully it won't be for long. The vibration doesn't seem to hurt her, just startle her and that does the job. I think the results could really vary from dog to dog and maybe the breed tendencies play into it. For the investment and result WE got it was well worth it to have less barking here in Hawaii and that peace for us and our neighbors.