National Institutes of Health

Dog DNA study maps breeds across the world

dog breeds
With a new dataset, man digs into the genetic history of his best friend.

Mapping the relationships between different dog breeds is rough (get it?), but a team of scientists at the National Institutes of Health did just that using the DNA of 1,346 dogs from 161 breeds. Their analysis, which appears April 25 in Cell Reports, offers a lot to chew on.

Here are five key findings from the work:

Dogs were bred for specific jobs, and this shows in their genes.

As human lifestyles shifted from hunting and gathering to herding to agriculture and finally urbanization, humans bred dogs (Canis familiaris) accordingly. Then over the last 200 years, more and more breeds emerged within those categories. Humans crossed breeds to create hybrids based on appearance and temperament, and those hybrids eventually became new breeds.

DNA from hybrid dogs backs up historical records.

Genetic backtracking indicates that, for example, mixing between bulldogs and terriers traces back to Ireland…