Assistance Dog - From Wikipedia

Assistance dog

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Guide dogs assist the blind and the visually impaired.

Hearing dogs, or signal dogs, help the deaf and hard of hearing.

Service dogs refers to dogs not specifically trained for visual or hearing impairment, but trained to do other work, such as mobility assistance dogs, seizure alert dogs or other medical alert dogs, and psychiatric service dogs. In the United States, the term "service dog" may be used synonymously with "assistance dog," and is occasionally used for other types of working dogs as well. In most of the rest of the world a distinct separation between service dogs and assistance dogs is observed. ...

To find out more about Assistance Dogs go to Service Dog Central at
www.servicedogcentral.org