Guide dogs can read traffic lights. Although guide dogs cannot distinguish between red and green, they can distinguish the different brightnesses of gray formed by traffic lights in their eyes. Relying on this skill, after a series of specialized training by humans, guide dogs can accurately follow the changes in light and shade of traffic lights. , to judge the difference between traffic lights, so as to correctly guide the blind to cross the road. Because the main colors in the dog world are only black, white and gray. Whether it is red or green, they are colors that do not exist in the world of dogs.

The functions of guide dogs:

1. Navigation. Can lead blind people to some frequently visited supermarkets, shops, rides, to school, and after school.

2. Shopping. Guide dogs will take blind people shopping. Many stores do not allow pets to enter, but guide dogs are an exception.

3. Accompanying. Sick or disabled people are very lonely. Guide dogs serve as emotional sustenance.

4. Look after homes and homes. If there is no one else at home, you can keep your guide dog at home. It can prevent theft and robbery.

5. Mental stress reduction. Guide dogs have a docile personality and can reduce mental stress, reducing the stress many people face in their lives.