I'm not sure why this is so bothersome to you. If for YEARS my dog has never growled at someone, and all of a sudden one day did growl at someone, why would that not be shocking/surprising? I'd be shocked if my dog jumped on the counter or excitedly peed when someone came over. Doesn't mean my dog is a robot and I don't let her be a dog or something asinine like that. It means.... I'm surprised you just did that because that's not a reaction you've ever had before. Easy.