How can I effectively use a dog whistle for barking control?

To effectively use a dog whistle for barking control, start by selecting a high-frequency whistle that is audible to dogs but not to humans. When your dog barks excessively, blow the whistle to interrupt the behavior. Repeat this consistently whenever your dog barks inappropriately, and reward them when they stop barking. Over time, your dog will learn to associate the whistle with the unwanted behavior and stop barking when they hear it. Remember to be patient and consistent in your training.