A lost sausage dog is to be reunited with his owners after RFS crews battling the NSW south coast fires found him running down a fire trail all alone.

A lost sausage dog has been reunited with his owners after RFS crews battling the NSW south coast fires found him running down a fire trail all alone.

The dog, named Wilbur, was found by RFS firefighters on Wednesday night just outside Turmeil in the Shoalhaven area.

Wilbur was running down the trail with the fire burning on either side of him when the RFS crew picked him up and took him back to their base at Burrill Lake, north of the fires.

Last night, the RFS and 9NEWS put the call out to try and find Wilbur's owners.

And this morning, the fire crews managed to make contact with Wilbur's family and reunited him with his owner Paul.

Wilbur is reunited with his owner Paul, thanks to the RFS. (Nine)

However, Wilbur's brother Olly, a 10-year-old beagle who ran off the property yesterday evening, is still missing. Crews are out searching for him.

The reunion came as firefighters in the area brace for tough conditions today with temperatures expected to climb into the 30s.

"Fire crews are preparing for what could be the most dangerous day yet with severe fire conditions fanning embers towards homes in Bawley Point, Kioloa and all the way down to South Durras. It's definitely a tense time down here," 9NEWS reporter James Wilson, who is on the scene at Burrill Lake, said.

Across the state there are still 100 fires burning, with 73 of those out-of-control.

The NSW Rural Fire service has issued widespread total fire bans for today, with hot and windy conditions expected to worsen across the state.