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Service animals are working animals that have been trained to perform tasks that assist disabled people. Service animals may also be referred to as assistance animals or helper animals depending on the country and the animal's function. Dogs are the most common service animals, having assisted people since at least 1927. Various definitions exist for a service animal. Various laws and policies may define service animal more expansively, but they often do not include or specially accommodate emotional support animals, comfort animals, or therapy dogs. Regulations regarding service animals vary by region. For example, in Japan, regulations outline standards of training and certification for service animals. In the United States, service animals are generally allowed in areas of public accommodation, even where pets are generally forbidden.