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If you want your dog to be a good watchdog, you will have to train him to be one. You have to be able to train him on identifying whether the person is a friend or an intruder. You would like to do this by doing activities outside where you will teach him when to bark, like for example your news boy or some strangers. Make sure that you point to him certainly which is which by rewarding if he made the correct barking or telling him no if he did not identify it correctly. And then after that, start training him at home too. It will just take time but the reward is really worth it after.