I'm more inclined to think that the tail is a hindrance to any serious romantic involvement. It basically reminds Lawrence and the audience that what he is dealing with is not quite human. He, unfortunately, had a similar comment in this episode. That pat on the head is further signs of it imo. You don't pat a cute 15yo female on the head or any female past 10 yo imo. However, you do pat a dog on the head.
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