This is the moment an off-duty New York City firefighter walking his dog in a Queens park is attacked by a vicious mob of teens — one of whom kicked off the beatdown by declaring it was "Fight Night," disturbing new video shows.

The 44-year-old victim said he was strolling with his 3-year-old Labradoodle Dylan in Juniper Valley Park in Middle Village at around 9:55 p.m. Friday when he was suddenly targeted by the mob.

"There were at least 100 kids … I was walking my dog. They just picked me out and approached me," the still-shaken victim, who asked to remain anonymous, told The Post Saturday afternoon.

NYPD officers wear masks in Times Square. The NYPD is training officers to spot fake license plates, which have linked to a number of shootings and other crimes, officials said Wednesday. (Roy Rochlin/Getty Images)

"One kid took his shirt off and said, ‘it’s Fight Night!’ He said he was 19 and said, ‘I could fight you.’ Everyone took their cell phones out. There were cell phones everywhere," he explained. "They all came at me…A kid came up behind me and hit me in the back of the head with a bottle and I let go of the dog," he said.

In video footage obtained by The Post, the mob can be seen closing in on their victim, who puts up his dukes as Dylan vainly barks in protest, attempting to protect his human best friend.

"Give him a shot! Give him a shot! Give him a shot!" one teen repeatedly implores, the video shows.

"Yo, what the f–k!" shouts a stunned onlooker as the unidentified victim is pummeled on the pavement.

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"Old guy with a dog got f–cked up," one teen is seen texting in the video.

The victim continued: "They didn’t care at all. The kids were going crazy. They were as high as a kite. I got hit, turned around, that’s when the kids started coming at me …. Then I was on the floor, holding one kid and an ambulance pulled up. They were waiting by the park … If they weren’t there I would have been in much worse condition."

Added the dad of three: "I’m a little lumped up. What are you going to do? Thank God I’m still here. It could have been worse."

Police on Saturday confirmed to The Post that the victim was struck in the head with a glass bottle at 75th Street and Juniper Boulevard North. No arrests were made. The pooch, who was scooped up by a good Samaritan, was not hurt.

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The victim, who turned down a trip to the hospital, said "there have been lots of incidents" recently in the park, which has become a haven for out-of-control teens from all over the borough.

"Kids are getting bikes stolen, an older man got beaten," he said, adding he found three knives Saturday in the park that he planned to turn in to police.

The victim said one group of kids was irritated when he scolded them about jumping the fence of a daycare center across from the park. Another resident, who was not harmed, complained about illegal fireworks being set off.

"This is a tight community … kids with bikes … Maybe I’m old-school, but there’s no respect," the smoke-eater added.

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GOP mayoral candidate Curtis Sliwa, the founder of the Guardian Angels, said he was alerted to the incident by residents who he said are asking his group to step up patrols amid "loud boom box music and fireworks are common into the early morning hours."

To read more of The New York Post, click here.

The Guardian Angels will begin patrolling the park starting 6 p.m. Saturday, Sliwa said after meeting with residents earlier in the afternoon.