Wow, this is really funny. My Pekoe sucked her tail for several months when she was really young. She started out on the tip of her tail, but eventually she would suck any part of her tail. I was ashamed at first but then I noticed that she would do it only when she was on my lap or curled next to me - like she was very content and happy. I eventually needed to trim the tip of her tail that was always wet and yucky. Since then, she has not sucked her tail or had the "want" to suck it. I sort of miss the little sound she would make. She is such a peach!