It is important to understand why he bit... probably, he was frightened - not understanding what you were trying to do.
- most importantly, consult with a dog trainer. It is important that you get advice from someone familiar with dogs who can observe his disposition.
- do not use a leash that he can chew through. use something like a sturdy chain leash. (i.e. do not put yourself in a position where you feel you need to touch his mouth.)
- in general, do not put your hands near his mouth. he does not trust you 'completely' (yet).
- hand feed him dinner, so that he gets used to having your hands near his mouth. (This should be ok, because this is the opposite of you grabbing his mouth - in this situation, the dog is moving to your hands.)
- when you pet him, gradually (over weeks and possibly months), move your hand closer to his mouth. Eventually, move his gums, as a vet would, to inspect his teeth. Be patient. If he tenses up or appears uneasy, then back off and go slower. When he is drowsy / sleepy, but awake, this is probably a better time to try this. He may also be sensitive about other parts of his body.... For example, my dogs are a little uncomfortable with me touching their paws. Do not forget to reward good behavior with praise, treats, playtime.
- you should also teach the "drop" command. If taught properly, he will learn the "drop" command long before you will be able to earn his trust.
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