Authorities say two dingoes that mauled a child on Fraser Island, off the southern Queensland coast, will be tracked down and destroyed.

The three-year-old girl was bitten on the legs while waiting to board a barge with her family at Hook Point yesterday.

The dogs leapt from nearby bushes, biting both of her legs.

People who saw the incident chased the dogs away.

Ambulance officials say the girl suffered multiple puncture wounds to her legs.

Terry Harper, from the Parks and Wildlife Service, says the dingoes will be put down.

"We have many witnesses who have provided some very useful information about the identification of those dingoes and in accordance with the Fraser Island dingo management strategy the dingoes responsible for this attack will need to be humanely destroyed," he said.

Mr Harper says the girl received first aid on the barge and was taken to Gympie Hospital for further treatment.

"There were no dingoes in view and the child was momentarily between adults when two dingoes came out from the bushes and attacked the young child," he said.

Dingo expert Dr Ian Gunn says the attack is very unusual.

"I am devastated for the little girl; it is quite amazing to hear why two dingoes have run out of the bush in broad daylight and attacked a little girl," he said.

"It just sounds totally amazing to me and out of character of normal dingo behaviour."

In 2001, dingoes were blamed for the death of a nine-year-old boy who was found dead near the island's Waddy Point.

Dozens of dingoes were killed by rangers as a result of the incident.