MIAMI COUNTY, Ohio -- Piqua fire investigators currently list as "undetermined" the cause of a fire that destroyed a house east of Piqua at 8575 Union-Shelby Road late Thursday morning.

Heavy smoke was coming from the rural home of Bruce Cotrell when firefighters from Piqua, Fletcher and Casstown rolled up on the scene.

A passing motorist stopped at the home of Clarence Smith Jr. to report the fire next door. Smith called 911 at 11:18 a.m.

The fire appeared to have started in the living room of the house, but what sparked the fire is unknown.

Damages to the house and contents are estimated at $85,000.

There were no injuries, while a family dog perished in the blaze.

Firefighters spent over 6 hours on the scene.