watchdog

Noun
  1. A guardian or defender against theft or illegal practices or waste (synset 110789275)
    "she is the global watchdog for human rights abuses"
    is a type of: defender, guardian, protector, shielder - a person who cares for persons or property
  2. A dog trained to guard property (synset 102106493)
    is a type of: working dog - any of several breeds of usually large powerful dogs bred to work as draft animals and guard and guide dogs
    subtypes:
    • kuvasz - long-established Hungarian breed of tall light-footed but sturdy white dog; used also as a hunting dog
    • attack dog - a watchdog trained to attack on command
    • housedog - a dog trained to guard a house
    • schipperke - breed of small stocky black dogs originally used as watchdogs on boats in the Netherlands and Belgium
    • pinscher - any of three breeds of dogs whose ears and tail are usually cropped
    same as: guard dog

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