A much-loved Queensland koala who was left fighting for its life in hospital after being attacked by a dog has died.

Teadoro was a four-and-a-half year old male koala who was frequently spotted around Tea Tree Bay in Noosa's National Park.

But on Thursday, Teadoro was found sitting on the ground with horrific injuries Yahoo News Australia reported.

A much-loved Queensland koala who was left fighting for its life in hospital after being attacked by a dog has died

Bernard Jean, spokesperson from Koala Crusaders, said Teadoro was spotted acting strangely.

'He was trying to climb but didn't have the strength in his arms,' Mr Jean said.

Upon examination, Teadoro had wounds to his abdomen, believed to be from a dog attack days earlier.

Teadoro was taken to Australia Zoo Wildlife Hospital where he was euthanised yesterday due to the severity of his injuries.

Teadoro was a four-and-a-half year old male koala who was frequently spotted around Tea Tree Bay in Noosa's National Park

'We must be personally accountable as pet owners to ensure dogs are kept away from wildlife as we live in their habitat,' Koala Crusaders ambassador Megan Halverson said.

'We want to live in beautiful places surrounded by wildlife, but if we do, then we must take care to do the right thing,' she added.

Mr Jean told The Sunshine Coast Daily the 'heartbreaking' news brought everyone to tears at the not-for-profit.

'We promise you that our faith and determination in protecting and preserving your brothers and sisters is reinforced,' he said.