We know this is a result of B1 dogs being common amongst the European dogs that their conquering owners brought around the world, because nowhere on earth is it a very common lineage in village dogs. (embarkvet.com)
«By comparing molecular sequences to infer genealogies, molecular phylogeneticists tell us that the two primary lines of descent lead to the eubacteria (or common bacteria, which include the photosynthetic bacteria) and to a second common lineage that subsequently divided to form the archaea (which like the eubacteria are prokaryotes) and the eukaryotes (which include all higher plants and animals). (scientificamerican.com)
The most common lineage among American and European dog breeds is A1a, including the vast majority of iconic breeds such as German Shepherds and Golden Retrievers, as well as most Border Collies, Scottish Terriers, and Irish Wolfhounds. (embarkvet.com)