Most modern dog breeds have small amounts of wolf ancestry from long after dogs were domesticated, according to a new study. The wolf DNA isn't left over from when dogs and wolves diverged; instead, ...

A major genetic study has found that nearly two-thirds of modern dog breeds carry measurable wolf DNA, pointing to interbreeding that occurred thousands of years after initial domestication.

The gray wolf, also called the timber wolf, is the largest member of the canine family with fur ranging from gray to brown, black or white. Smithsonian's National Zoo and Conservation Biology ...