Origin of the domestic dog as the Tibetan people. A population genetic analysis then showed a significant convergence between humans and dogs in Tibet. Like the Tibetan people, Tibetan mastiffs appear to have derived these benefits partially from the EPAS1 gene, acquired through introgression. In 2015, a study found that when dogs and their owners interact, extended eye contact (mutual gaze) increases oxytocin levels in both the dog and its owner. As oxytocin is known for its role in maternal bonding, it is considered likely that this effect has supported the coevolution of human-dog bonding. One observer has stated, "The dog could have arisen only
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