guard dog
or guard·dog
noun
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.
Origin of guard dog
First recorded in 1790–1800
Words nearby guard dog
guaraní,
guarapuava,
guard,
guard band,
guard cell,
guard dog,
guard duty,
guard hair,
guard of honor,
guard pin,
guard ring