They’re ready to paw-trol! Nearly two dozen newly minted  NYPD K9s graduated Friday from an elite, four-month training program — including a lovable bloodhound who’s set to sniff-out missing people. The 21 ruff-and-tough rookies, along with their handlers, are ready to take a bite out of crime after learning everything from how to collar bad guys to finding cadavers and bombs. The canine cops — who will serve in the NYPD’s elite ESU unit — included Vin, an adorable 1-year-old bloodhound with a “goofball” personality, named after fallen officer Vincent Danz. Police dog Vin with his handler Officer Christopher Alvarez. Michael Nigro for NY Post “It’s so funny, the dog is perfect, just because Vin was like just this — a happy-go-lucky goofball, you know, [but] very good at his job, took it very seriously,” Vincent Danz’s widow, Angela, 59, said at the graduation ceremony at Floyd Bennett Field in Brooklyn. “He was an incredibly kind human being.…