The "multiply by 7" rule for dog-to-human years has been replaced after scientists discovered dogs age faster than previously thought.

Dogs were domesticated around 11,000 years ago. Until recently, it was thought that breed diversity emerged in Victorian times. Recent studies of dog skulls have shown that diversity actually started ...

Dogs began diversifying thousands of years earlier than previously believed, with clear differences in size and shape appearing over 11,000 years ago. A massive global analysis of ancient skulls shows ...