Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Works well... with some fine tuning.

I bought 2 collars, one for a border collie and another for a dalmatian. For the border collie, it worked great; no problems whatsoever.For the dalmatian, her collar would seem to spray randomly which confused the poor girl. It sprayed when she drank water, walked on gravel, and for no apparent reason. We adjusted the collar multiple times without much improvement. We switched the dogs' collars. Curiously, both collars seem only to malfunction when on the dalmatian but not the border collie.What finally helped was putting an address label over the microphone. This reduced its sensitivity and now it only sprays when she barks. It's been 2 months and we have a nice quiet bark free home. It also worked great to stop their barking when in car. They used to be bark-a-maniacs when we drive by other dogs. Now they just look with blissful silence. If you have barking dogs, this collar is worth a try.