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There are many reasons that a dog may bark; - a dog may be barking at an unfamiliar object or sound - an aggresive dog may be barking at a human - a dog may bark at its toy etc..
Your dog will only bark when they see another person or a dog. He recognizes only you and barks to scare away the other people/dogs. You are the dog's "guardian," so it barks at other people because they want to protect you. In other words, if you love your dog, the dog loves you back by protecting you.

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12y ago

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