Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Citronella Anti Bark Collar

So glad we purchased this product. Bentley, a 20lb schnauzer, barked at everything. We tried a lot of things to break him of this habit and non of them worked. Now Bentley doesn't even wear the collar any more. All I have to do is show the collar to him and he immediately stops barking. One downside - the collar is very sensitive. If our other dog was in the same vacinity and barked Bentley would get sprayed.