Working smoke alarms alerted occupants of a home in Port Sydney to a fire early Sunday.
The Huntsville/Lake of Bays fire department said flames were visible through the roof when they got to the residence on South Mary Lake Road.
Two family pets perished.
Crews remained on scene for five hours putting out hot spots.
Damage is estimated at $400,000.
The cause of the fire is under investigation.
Banner picture provided: Huntsville/Lake of Bays Fire Department