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As we know, people who can't see live difficult lives. They may have trouble out. Also, they may feel when they stay at home by themselves. Can people solve these problems?
In 1918, a doctor and his pet dog walked with a blind soldier. The doctor had something to do in the hospital, he left his pet dog and the soldier for a short time. When he came back, he noticed his pet dog guided the soldier safely. So he made a that he would teach dogs to guide blind persons and he succeeded at last. This made the people who can't see .
The best dogs for the job are clever. It takes more than two years a little dog to be a guide-dog. When the dog is 14 months old, it can understand people's instructions(指令) . Then it will meet its new and they need to practice together for four weeks. the help of the guide-dog, the blind people's lives have changed a lot.
