My wonderfully lovable pit just wants to lick everyone to death! I want him to be a protector! I am lost on how to show him how and when its appropriate teo be "aggressive" and when its not. I dont want him to think its okay all the time but when someone knocks on our door in the middle of the night and he doesnt even bark or anything it concerns me, we got this specific breed because of what great family dogs they are as well and gaurd dogs. I want him to know the difference between hurting someone who is a threat and just being aggressive to anyone.