Therapy dogs are usually not assistance or service dogs, but can be one or both with some organizations. Therapy dogs are not trained to assist specific individuals and do not qualify as service dogs under the Americans with Disabilities Act.
Many organizations provide evaluation and registration for therapy dogs. Typical tests might ensure that a dog can handle sudden loud or strange noises; can walk on assorted unfamiliar surfaces comfortably; are not frightened by people with canes, wheelchairs, or unusual styles of walking or moving; get along well with children and with the elderly; and so on. Institutions may invite, limit, or prohibit access by therapy dogs. If allowed, many institutions have rigorous requirements for therapy dogs. United States-based Therapy Dogs International (TDI) bans the use of service dogs in their therapy dog program. Service dogs perform tasks for persons with disabilities and have a legal right to accompany their owners in most areas. In the United States, service dogs are legally protected at the federal level by the Americans with Disabilities Act of 1990.
In the United States, some organizations require that a dog pass the equivalent of the American Kennel Club's Canine Good Citizen test and then add further requirements specific to the environments in which the dogs will be working. Other organizations have their own testing requirements. In Canada, St John Ambulance provides therapy dog certification. In the UK, Pets As Therapy (PAT) provides visiting dogs and cats to establishments where pets are otherwise not available. Also in the UK Therapy Dogs Nationwide (TDN) provide visiting dogs to establishments.