He needs to learn bite inhibition. Right now his teeth are razer sharp. When you play, as soon as he bites too hard make a loud ouch like a puppy would make, take your hands away and stop play. Cross your arms and look away. Take him for socialising classes so that he can learn bite inhibition with other dogs. Have him neutered as soon as you can which will stop any testosterone aggression. If the above does not help please give me a shout... 0798837566.
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