There were no injuries in at a residence on Forest Street in Hamilton near Chebacco Lake.
The responded to the fire sometime at about 11 a.m.
Although no one home at the Cape Cod-style house at the time of the fire, a neighbor who spotted smoke entered the home and rescued three small dogs.
Forest Street resident Norman Beaulieu said he was driving by the home when he spotted smoke. He called 911 and ran into the house looking for the residents.
"I went in the house to see if there was anybody home. I yelled around and nobody answered me," Beaulieu said. "The dogs were there and I chased all around to get them. I brought them out and put them in the car."
The residents could be seen outside the home with all three dogs shortly after the fire was extinguished. The dogs appeared to be unharmed.
Hamilton Fire Chief Phil Stevens said the fire started in a second-floor bedroom.
"Luckily it was spotted before it got too big," Stevens said.
The front of the residence didn't appear to be damaged from the street, but a neighborhood resident said fire crews were working at the back of the house.
Firemen used axes to ventilate the roof, according to scanner reports.
A representative of the state Fire Marshal's office was on the way to investigate the scene at noon.
Stevens said more information on the fire would be available Monday afternoon.