The collar does its job and has helped my dog immensely. She is a nervous barker and now her barking is much better. I highly recommend this collar.

I have an Airedale Terrier that loves to scream at anything walking by the house. Put this on and forget it. If he is barking then the box moved around on his neck from his throat and is too loose. Change the batteries often, it is what makes this thing work!!!! Keep the box on the throat.

Bought one for a rescued bully that had severe old barking due to living on a 3 foot chain...he used to bark nonstop because thats all he knew.. this taught him to calm down in just a couple weeks. He never barked nonstop again. It did scare him the first couple time though. It was a lifesaver for all of us. He was so much more calm. He could lay by the window and watch people calmly after that.

I think the negative reviews below aren't really warranted. Just like any dog toy or food, each dog is so unique that not everything works universally. We've been using it for a week and the vibration does deter our puppy from barking nonstop. I worry that he may learn that he should only be quieter when wearing this collar and I do wish there was some way to do adjustments on vibration settings. There were a few times it vibrated when he sneezed or was rubbing himself along the sofa and I was not very happy about that. Overall his barking is more than cut in half and we are continuing to work with positive reinforcement to reward his silence. I'm waiting until the 45 satisfaction guarantee period to determine whether or not it is a success for us. I do wish this one was rechargeable.