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.
Also, guarddog.


Origin:
1790–1800

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Each band has a herder, guard dog, horse and sheep wagon.
Furthermore, you'd better have a good burglar alarm system or a reliable guard
  dog because house break-ins are frequent.
They are such energetic little clowns while also being the smallest guard dog.
Owning a guard dog requires a significant amount of investment and patience in
  training.
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