Petaluma fire officials credited a smoke alarm with mitigating losses from a bedroom fire that broke out early Thursday morning after a lamp in a woman's eastside home fell over and broke.

The resident of the house on Caulfield Lane was asleep when the 1 a.m. fire started and was awakened in time to get out safely with her small dog, fire Capt. Jim Gloeckner said.

She helped prevent the flames' spread by closing the door to the back bedroom, in addition to a hallway door, before exiting, he said.

The alarm "definitely did its job," Gloeckner said. "It alerted there that there was smoke in the house and the fire, and she woke up to fire and actually did a really good job of isolating the fire."

It helped, as well, that a fire engine was just finishing up a call nearby and arrived quickly at the house fire near Bluegrass Drive, he said.

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