My wife and I have two dogs, I have a yellow lab, and she has a shorky (shitzu & yorkie mix). They are great dogs, except I think they enjoy barking too much. We keep the dogs in at night, but when they're out during the day, anything makes them bark. I need a bark collar that actually works. We tried one of the cheap wal-mart collars and that was a waste of money. Anybody have any suggestions?