Stone Age dogs already came in different shapes and sizes

The diversity of dogs is thousands of years older than modern breed selection, a new study shows.

Dogs have existed in all kinds of shapes and sizes for thousands of years – long before modern breeds came about. New research now shows that the diversity among dogs began to take shape as far back as 11,000 years ago, and that some of these early types no longer exist.

Most people probably assume that the great variation in dog breeds is a modern pheno…