Anti Dog Whistle is an Ultrasonic dog repeller. This App offers a number of sounds for dogs to stop barking. Different breads Dog reacts to different frequency type . You should check which combination work for your dog! If your dog still barking you can add to it other sounds every 1 minute and make sure the frequency of sound is higher every time. This App is for you if you love your dog without their bark. We can not know what the dog's impulse to bark - but we know how to stop it with the right sounds. f your dog has an impulse to bark for no reason this anti dog bark is only a temporary solution! This App sounds doesn't cause any pain to Dogs. however just make them attentive and stop barking. Dogs Generally barks when they are afraid or curious about something. and this App in general make them attentive and stops them from barking.