① Most people have dogs as pets. They are "man's best friends". But do you know that dogs can also do different jobs?
② On September 11, 2001, terrorists(恐怖分子)attacked (袭击)the US and nearly 3, 000 people died. At that time over 300 dogs were there to help to find and save people. Dogs can help us work better in many ways as working dogs.
③ The most common jobs for working dogs are in search and rescue. They can find lost people or bodies after a big disaster(灾难)or in the wild.
④ Guide dogs can help blind people walk safely. To help blind people, dogs need to be trained in training schools for a long time and learn many skills, such as finding and following a clearway and moving around obstacles (障碍物) . They will stop when the traffic light is red and keep walking when it turns green.
⑤ There are also dogs working with doctors. They can help autistic (自闭症的) children. These children sometimes don't talk and like to do the same things again and again. A study from Canada showed that dogs could make these children feel relaxed and safe.
⑥ Herding dogs are important to sheep owners. They keep the sheep safe. They are common in Australia, New Zealand and some parts of China. Nowadays, many people have them as pets.