It happened after 12:30 am Tuesday at an eight-unit complex on Princeton and Weber.
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Crews say the fire was sparked in an upstairs apartment in the middle of the complex.
Firefighters initially had a hard time getting water to the flames because an illegally parked car blocked the hydrant.
Firefighters were eventually able to get a hold of the flames.
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The residents safely escape, but a family pet didn't make it out in time.
The dog died at the scene.
A cause for the fire is currently under investigation.