Another thing anyone wanting to use a dog whistle should know is to refrain from using it in crowded places where untrained dogs might be. Many people use them at dog parks, usually to call their dog back or to get his attention to play or train. But that also means that other dogs in the area can hear it, and that can make them nervous. You may end up with a whole pack charging at you, looking for the source of the sound, or at least a choir of howling and barking from those unfamiliar with the whistle. That’s why you should always ensure you know how and where to use that whistle properly.