• synonyms

guard dog

or guard·dog

See more synonyms for guard dog on Thesaurus.com
  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.
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Origin of guard dog

First recorded in 1790–1800
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018