Why do dogs bark? - The Secret Life of the Dog - Horizon - BBC

All dogs can trace their ancestry back to the wolf. But wolves howl and dogs bark. Scientist think the bark may have developed for human benefit. But can dog owners tell what their dog's barks mean? Subscribe to BBC Earth: http://www.youtube.com/subscription_center?add_user=BBCEarth BBC Earth YouTube Channel: http://www.youtube.com/BBCEarth BBC Earth Facebook http://www.facebook.com/bbcearth ...