Sarnia Fire and Rescue battled an early morning blaze on Tecumseh Street Friday.
Firefighters responded at around 3:30 a.m. to a large structure fire near Rose Street.
In a post to social media, Sarnia Fire and Rescue said crews battled through very tough conditions, but were able to knock down the flames in just over three hours.
No injuries are reported, and a family dog feared lost in the fire was located and is fine.
Further details, including cause and damage estimate, were not immediately available.