K-9 Guru Dog Whistle BETTER DOG OBEDIENCE: Train your dog to follow simple commands such as "sit", "stay", "come", "fetch", "recall", and more LONG DISTANCE RECALL (Hunters): Dog whistles can travel extremely long distances, so you can call your dog back to you no matter the distance. STOP BARKING FOR GOOD: Train your dog to quickly stop barking by blowing the whistle and interrupting their bark. Backed By Our Iron-Clad 100% Hassle Free Money Back Guarantee STAY SAFE FROM AGGRESSIVE DOGS : This whistle stops dogs from coming closer, allowing you to stay safe.