A guard dog, an attack dog or watch dog is a dog used to guard against, and watch for, unwanted or unexpected people or animals. The dog is discriminating so that it does not annoy or attack familiar people.
Read more about Guard Dog: Barking, Breeds, List of Breeds Commonly Used As Guard Dogs, List of Other Guard Dog Breeds
Famous quotes containing the words guard and/or dog:
“What is the structure of government that will best guard against the precipitate counsels and factious combinations for unjust purposes, without a sacrifice of the fundamental principle of republicanism?”
—James Madison (1751–1836)
“I am his Highness’ dog at Kew;
Pray tell me, sir, whose dog are you?”
—Alexander Pope (1688–1744)