The cur collared for assault after his service-dog pit bull chomped down on a subway straphanger blamed the victim as he was led out of a police station Thursday.

“She attacked me first. You will see,” barked Ruben Roncallo, 53, as he was led out of the Manhattan Transit Robbery Division. “It was on a leash.”

Roncallo and his dog were on a No. 4 train at the Wall Street Station around 4:25 p.m. last Friday when the pit went nuts on another rider, clamping its jaws on the girl’s foot and thrashing its head wildly.

A video, which went viral this week, shows other riders screaming at Roncallo to command the dog to let go — but he doesn’t appear to do much to help.

He was charged with assault and reckless endangerment, police said. Cops said the dog is a service dog, but it was unclear what service the animal was trained to perform.

Roncallo and his dog have long been a nuisance, according to a police source who dealt with 311 complaints about him.

“He was notorious amongst his neighbors. We had to warn him multiple times about the crazy dog,” the source said. “Every time we went over there we would have to deal with that dog.”

Former neighbor Patrick Lopez said its true that dogs mirror their owners’ personalities — and Roncallo drove his pooch nuts.

“The dog was bugging out all the time because of him though. People were scared of the dog, because the energy the guy gave off made the dog crazy,” he said. “I wish I was there to see him get arrested.”

Police said the animal is in the care of Roncallo’s family.

Roncallo was awaiting arraignment in Manhattan Criminal court Thursday evening.

MTA Chairman Joe Lhota encouraged straphangers to speak up if they see non-service dogs not enclosed in the subway.

Additional reporting by Shane Galvin