water dog
 會水的狗,水性好的人,水獺


 Wa·ter dog
 1. Zool. A dog accustomed to the water, or trained to retrieve waterfowl. Retrievers, waters spaniels, and Newfoundland dogs are so trained.
 2. Zool. The menobranchus.
 3. A small floating cloud, supposed to indicate rain.
 4. A sailor, esp. an old sailor; an old salt.  [Colloq.]

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 Hell·bend·er n. Zool. A large North American aquatic salamander (Protonopsis horrida or Menopoma Alleghaniensis). It is very voracious and very tenacious of life. Also called alligator, and water dog.

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 water dog
      n 1: a person who enjoys being in or on the water [syn: {water
           rat]
      2: a dog accustomed to water and usually trained to retrieve
         waterfowl