Fire crews were called to Chicopee Housing Authority apartments on Britton Street around 4:45 a.m., Chicopee fire authorities said.
Firefighters found a man and his dog trapped on a third-story balcony of the building and used a 35-foot ladder to rescue them from the flames.
No other injuries were reported, but the fire displaced 10 people.
Firefighters are investigating what sparked the blaze.
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