Pit Bull seen clamping down on subway rider's foot in harrowing video

Police are investigating after a pit bull was seen viciously attacking a woman inside a New York City subway car last week.

On Friday, a straphanger was standing on the 4 train that afternoon when the dog, which was on its owner’s leash, clamped down on the rider’s foot and would not let go. 

Other riders tried to free the woman’s foot from the dog’s grip.

The whole incident was caught on tape, and authorities are now trying to identify the dog's owner.

Would you know how to escape a dog attack in a closed space like the subway?

To find out, Inside Edition turned to Los Angeles-based veterinarian, Dr. Jeff Werber.

"Get their back legs if you can and lift them off the ground, if they start losing that sense of stability, they release as well," Dr. Werber said. "Good tips would be to remain calm. Don't agitate the dog or don't scream and don't get the dog worked up and certainly ask for help." 

Like most cities, dogs are banned from the New York City subways unless they're small enough to fit into a carrier. Large dogs are permitted only if they're guide dogs or service animals for those with disabilities.   

Tahsyi King recorded the shocking video of the pit bull attack. He says the dispute started when the woman found the dog actually sitting on the seat next to her. 

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NEW YORK, NY - JANUARY 1: The very first 2nd Avenue subway train open to the public arrives as a Q train at 57th Street and subway enthusiasts board the front car for the historical ride to 96th Street on January 1, 2017(Photo by Andrew Lichtenstein/Corbis via Getty Images)
Subway goers walk on the platform at the celebration for the completion of the Second Avenue Subway with New Year's Eve inaugural ride in Manhattan, New York City, U.S., December 31, 2016. Picture taken December 31, 2016. REUTERS/Elizabeth Shafiroff
Subway goers walk on the platform at the celebration for the completion of the Second Avenue Subway with New Year's Eve inaugural ride in Manhattan, New York City, U.S., December 31, 2016. Picture taken December 31, 2016. REUTERS/Elizabeth Shafiroff
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MTA Chairman and CEO Thomas Prendergast, Congresswoman Carolyn Maloney and New York Governor Andrew Cuomo ride the escalator while entering the 96th Street Station during a preview event for the Second Avenue subway line in Manhattan, New York City, U.S., December 22, 2016. REUTERS/Andrew Kelly
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People ride a subway train underground in New York November 2, 2014. This year marks the 110th anniversary of the subway system being open to the public. REUTERS/Carlo Allegri (UNITED STATES - Tags: SOCIETY TRANSPORT ANNIVERSARY)
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New York Mayor Bill de Blasio (2nd R) and New York City Police Commissioner William Bratton (R) enter the City Hall subway station while on their way to give a news conference in New York September 25, 2014. Bratton said on Thursday that the department boosted police presence on subways and city streets after the Iraqi prime minister's warning of a potential threat to transit systems from Islamist militants. Even so, Bratton and de Blasio sought to reassure New Yorkers that there was no specific, credible threat to the subway system or the city in general. REUTERS/Adrees Latif (UNITED STATES - Tags: CRIME LAW POLITICS CIVIL UNREST TPX IMAGES OF THE DAY)
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NEW YORK, NY - JANUARY 1: The very first 2nd Avenue subway train open to the public arrives as a Q train at 57th Street and subway enthusiasts board the front car for the historical ride to 96th Street on January 1, 2017(Photo by Andrew Lichtenstein/Corbis via Getty Images)
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NEW YORK, NY - JANUARY 1: The very first 2nd Avenue subway train open to the public arrives as a Q train at 57th Street and subway enthusiasts board the front car for the historical ride to 96th Street on January 1, 2017(Photo by Andrew Lichtenstein/Corbis via Getty Images)
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"She pushes it, ‘What is this dog doing on the chair?’ He was like, 'Yo! Do not push my dog!’ She just does it one more time and just goes swinging," she told CBS New York. 

Witnesses say the dog's owner never instructed the pit bull to let go.

Finally the woman's sneaker came off and the owner threw it at her. He also argued with other irate passengers.

Luckily, the woman did not sustain any injuries in the attack. 

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