GREENPOINT, BROOKLYN — The aggressive black mutt who has savagely attacked several dogs in Transmitter Park belongs to a man who refuses to leash his dangerous pet, according to Greenpoint residents. Locals have taken to social media to alert fellow dog owners, but failed to convince the dog's owner that he should compensate his dog's victims or take preventative action of any kind.

Monk, a 10-year-old Shar Pei, needed three surgeries after an aggressive black mutt tore into his neck, side, haunch and leg in Transmitter Park on Oct. 24, around 8:30 a.m., his owners told Patch. "She was going right for the jugular," said Greg Stevens, 40. "The dog just attacked, completely unprovoked."

"We've been shocked this whole time," added his fiancee Lauren Bender, 38. "We don't know what to do." Monk was just about to leave the park with Mateo, 45 — a friend of the couple who declined to give his last name — when the shaggy black dog came bounding toward Monk and dug her teeth into the grey Shar Pei's neck.

"It happened so quickly," said Matteo. "There was a frenzy." Mateo and the black dog's walker — whom Mateo described as a man with disheveled hair and a British accent — pulled the two dogs apart, but not before Monk suffered extreme injuries to his throat and down his right side.

The extent of Monk's injuries shocked even the staff at Long Island City Veterinary Center, where Monk underwent hours of surgery to clean and drain multiple bite marks, his owners said.

"They couldn't make heads or tails of it," said Stevens. "His leg was like hamburger meat."

"The vet kept saying what you never want to hear a vet say; 'It's worse than we thought.'" Monk's owners have since gone on the lookout for the aggressive dog's owner, canvassing the park and talking to fellow dog owners — several of whom reported less severe attacks from the same dog — and starting a Facebook group where several residents noted a black dog had been let off its leash and caused trouble.