WordReference Random House Unabridged Dictionary of American English © 2025
guard dog′, 
  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.
Also, guarddog′. 
  • 1790–1800

'guard dog' also found in these entries (note: many are not synonyms or translations):

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