It's ALL your fault no matter what breed of dog it is. :twisted: It's always the owners responcibility to not allow the dog to get into trouble in the 1st place. In the dogs mind your pack was challenged by two aggressive humans, "2 big guys in green uniform walked up close and personal ". You put the dog at sit (Good on your're part). However, in that situtation you unitentionally had your dog focused on the "perceived" threat. So of course when the Ranger offered his card the dog thought it was an aggressive move. I don't think that was a CC thing(breed specific). I know several Non-Molosser type mutts that would have done the same thing. Training is the proper recommendation. I think yopur GF should be involved in the training process. A good trainer can also educate her. She has an unrealistic expectations for someone that owns a molosser breed. The good thing is you see the potental for future problems and are open minded enough to look for answers. Good luck :D