Hi,
I have a 7 month old german shepherd female that is of a mixed lineage german,american,canadian(all sheperds thought). Kimber is our first shepherd, I used to have a mastiff who was mouthy for sure but she pretty much grew out of mouthiness quickly. Kimber, our shepherd, absolutely wonderful except for the fact that she's still "mouthy". I know that this is mostly in play she likes to grab a hold of arms and hands when she's excited, sometimes the biting gets a little hard thought (never punctured the skin but has left a couple of good bruises). She never is aggressive toward my husband, son (who's almost 2), or I but when I had her in a the vets office last week to get spayed I guess she had to be muzzled. My friend is the vet that owns the clinic and she said that it seemed like she was just really scared and that she really didn't want anyone to touch her, which I can understand the vet clinic is a scarey place. I read that working line dogs are more mouthy during pup stage, but I've also read that they're supposed to grow out of this. Any comments on how long this should last or how to stop it???
Thanks for reading my super long message!
Sincerely,
Marissa

try reading http://www.leerburg.com/qabiting.htm it might answer some of your questions, it did for me