A department spokesman said the officer had been taken to Sinai Grace Hospital after being injured on Prevost Street, west of Greenfield.
Officers responded to a suicide call at around 4:45 p.m Sunday. When officers approached the home, a neighbor was letting her American Bulldog out, and the dog charged at the officers.
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Officers attempted to retreat, officials said. One officer fired a shot at the dog but missed and hit their partner in the leg.
The officer was transported to the hospital and was listed in stable condition.