"Well, we thought we had a FANTASTIC product, but unfortunately, our lab mix finally became immune to it. He barks as soon as he's outside for 2 minutes - MAJOR seperation anxiety. Even after batteries were replaced, it was working properly, and he smelled strongly like citronella, unfortunately, he didn't care anymore. It looks like we're going to have to go to a shock collar :(. I would have rated it 3 paws because I know it did work, and if our dog wasn't so stubborn, it definitely would have been a life saver, but I don't like how quickly it wore through batteries - so 2 paws is the most I could give it."