Data from: Genomic and archaeological evidence suggest a dual origin of domestic dogs

The geographic and temporal origins of dogs remain controversial. We
generated genetic sequences from 59 ancient dogs and a complete (28x)
genome of a late Neolithic dog (dated to ~4800 calendar years before the
present) from Ireland. Our analyses revealed a deep split separating
modern East Asian and Western Eurasian dogs. Surprisingly, the date of
this divergence (~14,000 to 6400 years ago) occurs commensurate with, or
several millennia after, the first appearance of dogs in Europe and East
Asia. Additional analyses of ancient and modern mitochondrial DNA revealed
a sharp discontinuity in haplotype frequencies in Europe. Combined, these
results suggest that dogs may have been domesticated independently in
Eastern and Western Eurasia from distinct wolf populations. East Eurasian
dogs were then possibly transported to Europe with people, where they
partially replaced European Paleolithic dogs.