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Combination collars use both sound and shock to end barking. The most common are simply s Best Rechargeable Bark Collars hock collars with a warning tone that sounds at the first bark. After the warning tone, if the barking persists, your dog will promptly receive a mild zap, or a stronger shock stimulus depending on the particular bark control design. Next, there is again the type that gives progressively increasing shock along with progressively increasing sound as your dog continues his barking.