An assistance dog is any dog that is trained to assist a person with a disability.
What is an Assistance Dog?
An assistance dog is any dog that is trained to assist a person with a disability to alleviate the effect of the disability and meet the standards of hygiene and behaviour that are appropriate for an animal in a public place. This is the definition of an Assistance Animal under Australian Commonwealth Law. Some other countries use terms such as "Service Dog" or "Disability Aid Dog" to refer to assistance dogs. It is important to note that under Australian Law none of these terms apply.
In Australia only assistance dogs have any special protection or rights to access public places that pets are otherwise prohibited. Therapy dogs are different to assistance dogs and are welcomed in some public places that do not sell or serve food on invitation only. There is no such thing as an Emotional Support Animal under Australian law. Companion dogs are mentioned in some legislation. A Companion Dog is simply another term for a pet. They are not permitted anywhere that pets are otherwise prohibited.