bob·tail /ˈbɑbˌtel/
  短尾,截短的尾,截尾的動物
  Bob·tail n.  An animal (as a horse or dog) with a short tail.
  Rag, tag, and bobtail, the rabble.
  Bob·tail, a. Bobtailed. “Bobtail cur.”
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  bobtail
       adj : having a short or shortened tail; "bobtail mare" [syn: bobtailed]
       n 1: a short or shortened tail of certain animals [syn: bob, dock]
       2: large sheepdog with a profuse shaggy blue-gray-and-white
          coat and short tail; believed to trace back to Roman
          occupation of Britain [syn: Old English sheepdog]