High frequency dog training whistle is a useful tool to control dogs excessive barking. Dog whistles are very popular to train your dog without hurting your pet through shocks and other means. Its ultrasonic sound is effective to stop barking and also harmless for dogs. When you blow your dog whistle, your dog would immediately stop barking after training.The ultrasonic dog whistle is adjustable to fine tune the proper frequency to get your pet dog to respond. The sound will not annoyed you and who is around you, it is an ultra-sonic sound that is fit dogs well.Train your dog to follow instruction, sit, come, stop barking, stay and more. Impact discipline and personally control your dog by issuing sequences that only he/she understand, regardless of their age, gender or breed. Enjoy complete training freedom with Poodles, Border Collies, Sheep, Gun Dogs, German Shepherds, Bulldogs, Terriers, Rottweilers, Dachshunds, Huskies.Dog whistle designed reasonable small size and made of premium stainless steel material, convenient to have it and long lifespan. Whistle sound is not so clearly for humane but is enough for dog.