First I tell Tucker "No Bite!" for a few times.  I try giving him a toy to chew on instead of my fingers.  If that doesn't work, I put him down or I leave the room to teach him we don't play like that.  Then I come back and he's happy to play with his toy.  These were the suggestions my trainer gave me.  He still gets in his biting moods, but it is becoming less and less.  It will help more when I can get my husband to stop playing with his hands and Tucker.  He likes to have Tucker chase his hands, then Tucker bites them.  He is improving as well.
 
Training the dog, training the husband! 
