Origin of the domestic dog that was the most divergent group. The study found that the skulls of the "Goyet dog" and the "Altai dog" had some dog-like characteristics and proposed that the may have represented an aborted domestication episode. If so, there may have been originally more than one ancient domestication event for dogs as there was for domestic pigs. One theory is that domestication occurred during one of the five cold Heinrich events that occurred after the arrival of humans in West Europe 37 000, 29 000, 23 000, 16 500 and 12 000 YBP. The theory is that the extreme cold during
Karakachan dog working purebred livestock guarding Karakachan dogs are found in Bulgaria and the United States. The Karakachan was officially approved as a Bulgarian old native breed in 2005. The Karakachan dog may be a descendant of ancient Balkan domestic dogs, possibly since the time of the Thracians. In ancient Thracian treasures, figures were found of big, longhaired guardian dogs with curled tails. The Karakachan dog is part of the origin of the Bulgarian Shepherd dog, with which it should not be confused. Bulgarian Shepherd dog is new construction result of mixing of Karakachan dogs with some big Eurasian breeds - Caucasian