Dogs can be service bound with specialized training for the disabled or work bound servicing in the home as pet assistants. Federal law protects the right to have a service dog in public provided the dog has passed the correct training. It also allows access to living quarters for working pets where animals are not allowed.

Service Dogs – have public access and travel free under federal law
Brace/Mobility Support Dog (BMSD) – provides a brace or counter balancing and wears a harness for the job, trained for daily tasks such as doors and retrieval – guidelines for dog size are 23” or taller & 55 pounds, have access in public

Medical Assistance Dog – trained for a variety of medical assistance tasks

Psychiatric Service Dog (PSD) – assists with anxiety and depression

Visual Assistance Dog – guides visually impaired and the blind, has a harness

Wheelchair Assistance Dog – provides assistance with retrieving, doors, technology, transfers, and more.

Working Dog – do not have public access unless the dog has passed specific training
Emotional Support Animal (ESA) – provides emotional support at home and in travel, may have no specialized training

Therapy Dog – well-trained dog providing emotional support and love as pets, have public access when invited by entity

Service dogs are trained for autism, sensory process disorder, allergen alert (AAD), diabetes (DAD), hearing, medical alerts (MAD), PTSD, seizure response, facility dogs to provide therapy for entities such as nursing homes and counselor’s office, and amazingly courthouse companion dogs to assist people with difficult testimonies. Aside from medical services, dogs assist these agencies: police, fire, search & rescue,  customs & border patrol, and the military. They sure are incredible!

Resources
Anythingpawsable: “Learning About the Different Types of Service Dogs” from, http://www.anythingpawsable.com/types-of-service-dogs/