Dogs who serve people in their everyday lives are called
assistance dogs. Over just the past 75 years, people have trained
dogs to perform numerous tasks to help people who are blind, deaf,
or mobility-impaired. Guide dogs for the blind and service dogs
for the mobility-impaired are usually golden retrievers, Labs, or
German shepherds because of their strength, size, and
receptiveness to training. Hearing dogs serving the deaf can be
any kind of dog when given special training, even a tiny Yorkshire
terrier.