Clifton firefighters say a metal can had an unidentified material in it and it spontaneously combusted overnight, causing some damage to a garage.
It happened just before 4 a.m. on Forelle Street in Clifton.
Clifton Fire responded with one fire truck, and firefighters were able to knock down the flames in a matter of minutes.
They say the homeowner was awake, and tried to remove several items from the garage while it was on fire. He had to be treated at the scene for smoke inhalation.
He and his dog are expected to be fine. No word yet on how much damage the fire caused.