Using a photo from the city, the state herpetologist identified it as a northern watersnake, a much more common, nonvenomous snake. The post Report of rare, venomous snake in Mass. city likely ‘a case of misidentification,

The Attleboro, Massachusetts community is being extra cautious after first responders say a copperhead snake potentially attacked two dogs in the same area, which is rare. Firefighters sent out a warning, saying the two dogs were recently bitten near the Ten Mile River and Milk Street and reports say it's a copperhead snake.