The incident took place around 12:30 a.m., Wednesday, Oct. 27 in Setauket.
That's when Suffolk County Police responded to a home on St. George Glen Road for a report of a dog attacking three residents.
According to police, when officers arrived on the scene, a 6-year-old English Bulldog attacked the officer, and the officer shot and killed the dog.
The residents, two women, and a man, along with the officer, were transported to Stony Brook Hospital for treatment, police said.
The dog belonged to the residents.
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