The suspected outbreak was in a difficult to access part of a large chimney in the 17th century historic King’s Arms Hotel.
A spokeswoman for the Scottish Fire and Rescue Service confirmed crews spent much of the afternoon at the scene.
The tenders included a specialist aerial ladder platform from Dumfries.
A spokeswoman for the hotel told DnG24 that they had called out the brigade as a precaution.
She said: “We asked the firefighters investigate when we spotted some debris coming down into a fireplace.
“Everything seems fine now and we will remain open as normal.”