As people peer into DNA for clues to health and heritage, man's best friend is under the microscope, too. Genetic testing for dogs has surged in recent years, fueled by companies that echo popular ...

How many times has someone asked you, “What breed is he?” when they meet your dog? Sometimes, a dog’s breed is clear: after all, it’s pretty hard to confuse a Great Dane for a Dachshund. But ...