编辑一篇关于狗的文章，并在其中添加一段描述狗狗历史的文字。


Dogs are one of the most popular pets in the world.
Dogs have a rich history dating back 30,000 years. They were domesticated from wolves by early humans who recognized their usefulness for hunting, guarding, and companionship. Over time, different breeds were developed for different tasks, from herding sheep to tracking game. Today, dogs continue to be beloved companions and serve important roles as guide dogs, therapy dogs, search and rescue dogs, and more. They are truly man's best friend.