The earliest known evidence of humans using guard animals dates back to the time of cavemen, when mankind first tamed the wolf to serve as a cute and cuddly pet. These wolves still maintained some degree of being wild during the process of domestication, and they would inevitably attack humans who stroked their fur the wrong way or forgot to take them out on walks. Most of these wolves were artificially selected against to produce the relatively docile modern dog, but some of the more sadistic cavemen had better ideas. They kept these wolves to guard their caves against bears, burglars, and burglars riding bears. Over time, early wolf breeders managed to cross the viciousness of these wolves with the smaller size of most dogs to increase their danger density, which led to the invention of