Jack does that too! All you have to do is say "Jack, let me take your collar off" and he starts growling, baring his teeth. But he has never bitten. Actually, it seems to me that when he growls, he is actually talking, because it has different pitches. He also throws a few moans in there for good measure. If he is growling and you bend down and say "give me kisses", he licks your face. Go figure.
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