Say bye-bye to obnoxious barking. Viatek's high-tech bark control devices emit sounds that only a canine can hear. The audio is harmless to them, and undetectable by you. Choose a large stationary device for your home or backyard. For on-the-go convenience, a handheld device packs bark-stopping power in a sleek, portable package. Koolatron's Bark Free is another with ultrasonic frequencies only heard by dogs and cats, or lower sound tones audible to human ears.
I'm a serious dog lover and I appreciate that controlling a dog's bark is tricky. (I once had a neighbor whose dog barked all day and all night. When I asked him to do something he shrugged. "What can I do? Dogs bark.") These excellent electronic devices prove him completely wrong.