A South Australian mother says her children were left "completely traumatised" after her family's assistance dog was refused entry to a holiday park in Adelaide at the weekend.

Key points: The family had planned to stay at the holiday park in Marion for the weekend

The family had planned to stay at the holiday park in Marion for the weekend Murrianna Reese claims park staff refused entry to their assistance dog Hunter

Murrianna Reese claims park staff refused entry to their assistance dog Hunter The park has told the ABC the dog did not have the correct certification

Murrianna Reese said her family had organised to stay at the Marion Holiday Park, in Adelaide's south, but had to cancel their plans after staff denied entry to their assistance dog.

The mother-of-three from Murray Bridge said the family's labrador, named Hunter, was a vital support for all three of her children.

Hunter the labrador is trained to follow and keep Logan out of danger. ( Supplied: Murrianna Reese )

She said her son Logan, 8, had an acquired brain injury, epilepsy and was also autistic and non-verbal, her daughter Mystique had a form of deafness and was also autistic, while her eldest son, 15-year-old Zach, also had autism.

She said Hunter, an assistance dog in training, was a big help for all three children, and provided vital support to them as parents.

"Hunter helps all of them go out and about and helps us as parents take them out and about in society," she told the ABC.

"Logan runs away and hides and you get no response, but since we've had Hunter that's decreased from every time you go out in public to once every four months.

"Even then, he doesn't run away and hide, he stays within sight of Hunter and Hunter is trained to follow him and keep him out of danger.

"He just supports them daily, not just them, us as parents as well."

Ms Reese said the family arrived at the caravan park on Saturday and as a courtesy she informed staff of the family's assistance dog when checking in.

The Marion Holiday Park in Adelaide has a pool and waterslide. ( Facebook: Marion Holiday Park )

That was when Hunter was refused entry and she was told "no pets allowed".

"I said he's not a pet, he's an assistance dog and I showed them my ID," she said.

"Our support worker who organised it all for us, put in there that there's an assistance dog and we've been there previously.

"I said he's already been here in the past … you have no right to refuse him."

Son was left 'completely traumatised'

Ms Reese said Hunter was a registered assistance dog with Brama Labradors Inc. in Victoria, and was classified as an assistance dog with the South Australian Government.

While she admitted the ID she showed staff had expired, staff told her it was "not sufficient enough".

Because of this, she informed staff that she would be making a formal complaint to the Human Rights Commission.

Hunter the labrador offers support for Logan, who is living with autism. ( Supplied: Murrianna Reese )

"[Staff] made a phone call to the owner and said 'because he is not a vision-impaired [assistance] dog, we can refuse access to him'," she said.

"We informed them I was going to make a complaint to the Human Rights Commission about this and that it can face up to a $10,000 fine.

"One of them actually said 'we'll take that fine' … so I filed a formal complaint yesterday."

She said while the ordeal might not seem like a big deal to some, it had a detrimental impact on her family.

"My daughter broke down and was crying inconsolably," she said.

"It's completely traumatised [Logan] that he's not allowed to have Hunter with him and I'm going to have to deal with that and try to calm him down.

"We had to head back to Murray Bridge because most of the accommodation was booked out … we had prepaid that $1,500 and we're tight on money so that was our budget."

Accreditation provides 'public access rights'

A spokesperson for the holiday park said she regretted "the inconvenience to Murrianna Reese and her family", but said the reason the dog was refused entry was because the documentation was out of date.

"While we do not accept pets into the park, we welcome and accommodate accredited or certified assistance dogs," the spokesperson said.

"They are critical and supportive in the lives of people who need them. The park, therefore, routinely accommodates assistance dogs.

"When Ms Reese booked, she advised that she wanted to bring with her an assistance dog. We responded by email to request that the required documentation be sent to us to enable the booking to proceed. We did not receive a reply.

"When the family arrived at the park on Saturday, the document that they presented had expired. The dog was not accredited or certified. We could not allow it in the park. We fully refunded all money paid.

"In the interests of park patrons, we are obliged not to allow pets into the park and must insist on proper documentation."

Ms Reese with the family's assistance dog Hunter. ( Supplied: Zach Crouch )

Ms Reese said Hunter was registered with the SA Dog and Cat Management Board which states on its website that accreditation provides assistance dogs with "public access rights".

It also stated that accreditation of an assistance dog by the board was "not an absolute requirement for a person with a disability to claim public access rights due to the protection that is available under the Commonwealth Disability Discrimination Act 1992".

"Therefore, if a dog has been accredited by an overseas or interstate agency, you may already have public access rights with your dog under the Commonwealth DDA," it stated.

In a statement, South Australia's Equal Opportunity Commissioner Niki Vincent said she could not comment on the case and the matter would be handled by the Australian Human Rights Commission.

"While I cannot comment on specific cases, it is a breach of South Australia's Equal Opportunity Act to discriminate against someone because they are accompanied by an assistance animal that has been accredited under our state's Dog and Cat Management Act," Dr Vincent said.

"There are specific provisions in Commonwealth legislation that apply to assistance animals registered in other states and territories, with complaints relating to those matters handled through the Australian Human Rights Commission."