The two subspecies split about 20,000 years ago. But since then, they may have interbred more often than Smithsonian ...
The scientists found that 64.1% of modern breed dogs carry wolf ancestry due to genetic crossbreeding nearly 1,000 ...
U.S. scientists analyzed the DNA of numerous modern-day dog breeds, and found that two-thirds of pet dogs have traceable wolf ...
The wolf DNA isn't left over from when dogs and wolves diverged; instead, it most likely came from interbreeding in the past ...
Some massive breeds such as the St. Bernard completely lack wolf DNA, but the tiny Chihuahua retains detectable wolf ancestry ...