TOOGOO SMALL MEDIUM BIG NO ANTI BARK DOG TRAINING SHOCK COLLAR No bark stop dog from barking anti bark collar Having issues with your dog constantly barking all the time? Looking for a way safe and effective way to control your dogs barking Look no further How it works: If your dog starts barking the collar first applies a warning tone which increasingly gets louder to the point where a shock is issued if the dog continues to bark.