I have a 6 month old black german shepherd. He is a quick learner, he can sit, drop, stay, shake and fetch.HOWEVER, he is too protective and aggressive when people approach me, or with other dogs. His hair raises, he growls, pulls, snaps, and goes for people. He even bit the dog trainers hand once. I have decided to muzzle him in public. Is this OK? How can I change this behaviour? What is appropriate physical discipline for him? Will he grow out of this? Aside from this he is a perfect boy!!!!
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