Since attention is what he seems to want, time-out in another room, away from people, might help. Just walk him to the room quietly, ignoring all nibbling or attempts for attention. Start with a short time-out (3 minutes?). If there is no improvement in a week, increase the time to 5 minutes. However, if he is nibbling for attention, I suspect even a short time-out may teach him. Note: when you let him out in the beginning, he is going to escalate the demand for attention. You have to be quiet and consistent. Might take ten or twenty times in the time-out room the first time before he figures out the need to be quiet. Then, the next time, he is going to act as if the previous time never happened.
He learned this over two years, so don't expect an overnight conversion. Just keep in mind what a fantastic companion he is going to be once he gets over this little hurdle.
Good luck.
kjd
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