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A FAMILY locked themselves inside their home on Thursday night after their dog suddenly became aggressive and attacked them, prompting an emergency response from authorities.

The frightening ordeal unfolded for several hours at the family's residence in Harmony Hall, Marabella, where the animal reportedly turned vicious and bit two members of the household.

With the help of neighbours, who were alerted by the commotion and cries for help, the family members left the house before first responders arrived.