my puppy who is a little over 4 months now has this problem aswell, when he is playing with you, instead of licking like other dogs do, he will bite... i know its not aggressive because it is too soft and he has accidently bitten me while trying to bite a toy before and that friggin hurt!... i just cant get him to stop biting... the things he goes after most are your thumb joint and your shirt... i have read that to get them to stop this play biting you are suppossed to try yelping like u are another puppy and showing him that he is being too rough, but this has not seemed to do anything so far.
