Origin of the domestic dog matched across Eurasia and its branch is phylogenetically rooted in the same sequence as the Altai dog (not a direct ancestor). The subclade d2 hybrid haplotypes are found in 2.6% of South-West Asian dogs. Haplogroup E: Derived from post-domestication wolf–dog hybridization in East Asia, (rare distribution in South-East Asia, Korea and Japan). Haplogroup F: Derived from post-domestication wolf–dog hybridization in Japan. A study of 600 dog specimens found only one dog whose sequence indicated hybridization with the extinct Japanese wolf. It is not known whether this hybridization was the result of humans selecting for phenotypic traits from local wolf populations
Origin of the domestic dog had been calculated in an earlier study. Using the 7,000 YBP specimen and this mutation rate, the dog-wolf divergence time is estimated to have occurred 36,900-41,500 YBP and this is consistent with the timing found with the Taimyr-1 specimen in an earlier study. In 2018, a study looked at the y-chromosome male lineage of canines, including the ancient fossils of the Herxheim, Kirschbaum, and Newgrange dogs. The study identified six major dog yDNA haplogroups, of which two of these include the majority of modern dogs. The Newgrange dog fell into the most commonly occurring of these haplogroups. The two ancient