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Synonyms

guard dog

American  
Or guarddog

noun

guard dogs plural
  1. a large, aggressive dog, as a German shepherd or Doberman pinscher, trained to guard persons or property and often to attack or restrain on command.


Other Word Forms

Noun Inflected Forms

Etymology

Origin of guard dog

First recorded in 1790–1800

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

See Examples For:

Anatol Ward, a Tokyo resident in his 50s, said the robot reminded him of a guard dog.

From Barron's Jan. 30, 2026

Why buy a guard dog when the neighbor owns a wolf?

From MarketWatch Jan. 10, 2026

The breed “is not the best choice for a guard dog since they are extremely friendly, even with strangers,” according to the United Kennel Club.

From Los Angeles Times Jul. 22, 2025

To find out, the researchers asked Montana farmers who were regularly visited by grizzly bears to host a guard dog.

From Science Magazine Apr. 11, 2024

He looked like a guard dog snarling at a trespasser.

From "Here to Stay" by Sara Farizan

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