My wife had an old highschool friend that she has not seen in 20 years come over the other night (yes, he is black). Nice guy, very soft spoken and I swear Angus was going to eat him alive! Had to put him in his kennel and every now and then you could hear his deep growl. Its weird, some "strangers" he absolutely loves and others his hackles will come up. Maybe he is a good judge of character or he needs to go to decaf?