Professional Dog Whistle to Stop Barking (1-pack with lanyard), (dog whistle training, pet whistle, dog whistle lanyard) by Chummy D Finally stop dog barking with the Chummy D dog whistle, and handy lanyard. Easily adjustable whistle to find the response frequency of any dog, assuming your dog isnt deaf. Simple instructions for adjusting the dog training whistle are included. You can also use the pet whistle to teach your dog other commands. Dog whistle training. Easily adjust the frequency of the dog whistle to find the response frequency of any dog, assuming your dog isnt deaf. Simple instructions for adjusting are included. Durable nickel-plated whistle designed for you to be able to conveniently take it with you and your dog. Chummy D dog whistle to stop barking and easily detachable lanyard. Dog whistle lanyard.