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A raggedly dressed man being bitten by a house guard dog. Etching by Thomas Lord Busby, ca. 1826.

A guard dog or watchdog (not to be confused with an attack dog) is a dog used to watch for and guard people or property against unwanted or unexpected human or animal intruders.^[1]^[2]

^ Department of Economic Development, Jobs. "Guard dogs". agriculture.vic.gov.au. Archived from the original on 17 March 2020. Retrieved 3 May 2019.
^ "Definition of GUARD DOG". www.merriam-webster.com. Retrieved 3 May 2019.