$31 Indoor Bark Control System

I read that these type systems work best with dogs with stand up ears

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One (1) Indoor Bark Control System for $31

Teach your pup to use his indoor voice with the Ultrasonic Indoor Bark Control System from PetSafe! This device can detect your dog's barking from up to 25 feet away, and when it does, it emits a two-second ultrasonic tone correction (inaudible to most humans). Your dog will learn to associate barking with the unpleasant sound - say goodbye to problem barking! Requires one 9-volt alkaline battery (not included).