Last I researched, the upper jaw can grow faster than the bottom jaw; thus some puppies can have an overbite until they are done growing. If it doesn't go away by time he's 12 months it probably never will... however, I have seen overbites completely correct themselves with time.
Feeding a food that is too high in protein may cause this problem (though I'm not sure that's ever been 'proven')
Murdock, BH - GSD
Virgil, CGC - GSD
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Tara, Reagan, Madison, and Jefferson - Aussies