These units represent a good alternative to shock collars. They emit a short sonic beep in direct response to the dog's bark. Mild Sonic collars take longer to work  Best Rechargeable Bark Control Collars  than shock collars, but over time they teach your dog to stop barking equally as well, so pet owners that have concerns over pain or trauma to their dog can choose this type of bark control as a good alternative to shock.

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