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How to stop your dog from barking at strangers
Recognize the causes of your dog's territorial barking.
Often, dogs who bark at strangers are demonstrating territorial barking. This type of barking occurs because your dog is fearful and sees strangers as a potential treat.
Dogs are wired to defend their territory, so they will use their bark when they detect unknown people in familiar places like their homes and their yards. In fact, your dog may be so motivated to bark at the perceived threat that he may ignore your shouts to stop barking or any scolding you might give him.