Therapy Dogs are highly trained dogs that visit facilities like nursing homes, adult day care centers, schools, etc. They can also be on call to comfort people during disasters. The dogs are trained by their owners to be EXTREMELY well-behaved and then evaluated by dog trainers on behalf of organizations like Therapy Dogs International.
The dog and owner are then registered and insured with the organization and pick facilities to visit on a regular basis. My Newfoundland has been a TDI dog for three years. I take off Friday every week to visit an adult day care center for the handicapped.
Therapy Dogs are NOT Service Dogs so they can not go into stores, schools, the movies, etc. They can ONLY go to facilities that INVITE them to visit. If you're caught doing this with a TDI dog you will be banned for life from being a therapy team.
Therapy Dogs are also not Emotional Support Dogs. ESD's are just PETS with NO training, registration, insuring. They do NOT have Service Dog access rights, either. They are nothing but glorified PETS and people are really abusing this bogus designation by calling them "needed" Service Dogs which is a FELONY.
TDI Therapy Dog team for over 3 years. Also had a Therapy Dog years ago with the Humane Society of Broward Counties therapy dog program.