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This app isn't meant to replace a real squawker device: it's an emergency backup if you don't have a squawker on you when you need one.
If your dog is a breed or has a temperament where you don't need to use this in an emergency, you could simply use it to get your dog's attention (maybe to take a photo) or as a training signal.
Have a story about how this app helped you call back or train your dog? Please share it via a review of the app.