1. Any of several large aquatic salamanders
   "The mudpuppy is a type of waterdog found in North American rivers"

1. A dog accustomed to water and usually trained to retrieve waterfowl
   "The water dog eagerly jumped into the lake to retrieve the duck"
    
2. A person who enjoys being in or on the water
   "The water dog spent every weekend at the lake, either swimming or kayaking";
   - water rat

Derived forms: water dogs, waterdogs

Type of: ambystomid, ambystomid salamander, gun dog, sailor, sporting dog

Encyclopedia: Waterdog