Frankie, a State Police dog, helped Spencer police arrest a suspect who ran away from them into marshy woods on Monday night, police said.

Police received a call at about midnight reporting that a man had threatened his girlfriend, who had then run out of her home on East Charlton Road.

While responding to the residence, Officers David Sullivan and David Allen found there was an outstanding warrant for the arrest of James Mahoney, 40, on charges of assault and battery with a dangerous weapon, domestic assault, and using a motor vehicle without authority, said Sergeant John Agnew.

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When officers arrived, Mahoney ran into the woods. Officers were unable to locate him, Agnew said.

Officers called State Police for K-9 assistance. Frankie, a Belgian Malinois who has been with the State Police since 2012, arrived at the scene, along with his handler, Trooper David Stucenski, at 1 a.m.

Frankie found Mahoney in the woods and alerted the officers, police said. The dog also bit Mahoney. Mahoney was taken into custody and transported to the Harrington Memorial Hospital in Southbridge for treatment of the bite.

After Mahoney was treated, he was taken to the Spencer police station. He is to be arraigned at the East Brookfield District Court later this week, police said.