A guard dog or watchdog is a dog used to watch for and guard people or property against unwanted or unexpected human or animal intruders.
A raggedly dressed man being bitten by a house guard dog. Etching by Thomas Lord Busby, ca. 1826.
Roman mosaic of a large chained dog (with cropped ears and docked tail) at the Archaeological Park of Lilybaeum, Marsala, Sicily
German Shepherd dog guarding property
Guard dog training with Presa canario dog
The dog is a domesticated descendant of the wolf. Also called the domestic dog, it is derived from extinct gray wolves, and the gray wolf is the dog's closest living relative. The dog was the first species to be domesticated by humans. Experts estimate that hunter-gatherers domesticated dogs more than 15,000 years ago, which was before the development of agriculture. Due to their long association with humans, dogs have expanded to a large number of domestic individuals and gained the ability to thrive on a starch-rich diet that would be inadequate for other canids.
Image: Blue merle koolie short coat heading sheep
Image: Dog നായ 6
Image: Chin posing
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