WASHINGTON — A Beltsville woman has been discharged from the hospital after a malfunctioning water heater caused her home to fill with carbon monoxide.

It happened around 4:30 p.m. at the in 4900 block of Powder Mill Road.

Mark Brady with Prince George’s County Fire says the woman’s daughter came home to find the woman and the family’s dog unconscious. The dog did not survive. The woman was taken to a local hospital Sunday night and is expected to live.

She was discharged from the hospital Monday night.

Brady says had her daughter arrived moments later, she wouldn’t have been so lucky.