Humans have been breeding dogs for ages. After all, our four-legged best friends are faithful companions, and they've helped us in a number of tasks over the centuries, from hunting to herding. But like many other animals, some dog breeds went extinct. The reasons for this vary, but sadly we will never have the chance to see these dogs again.
In this gallery, you will find a number of extinct dog breeds, many of which you probably never knew existed. Click on to learn all about these fascinating dogs from the past.