A video has gone viral that purports to show a woman hitting—and even biting—her small dog on a Toronto subway train, as reported by Global News.

The footage shows the unidentified woman pulling the dog and repeatedly yelling to “stop it.” The Ontario Society for the Prevention of Cruelty to Animals (OSPCA) announced they are investigating the incident, which apparently occurred on a Toronto Transit Commission (TTC) train Friday afternoon.

“Stop it. Now. You hear me?” the woman can be heard saying

At one point in the video, the woman can be seen biting the skittish canine’s head and pulling the dog’s fur from her mouth.

The abuse continues, with the woman continuously slapping the dog and yanking the pup’s leash so hard that it yelps, the video shows. At that point, a man on the train decides to intervene.

“You’ve got to stop hitting your dog,” the soft-spoken subway rider can be heard saying.

The woman, who appears confused, says “Pardon?” several times before getting angry.

“Who are you?” she asks the man. “What the f*** are you talking about?”

The irate woman can be seen telling the good samaritan to move somewhere else and to “get the f**k out of my face.”

Roxy Huang, who recorded the disturbing ordeal, claims that another bystander went to the train driver’s room during this exchange, ostensibly to seek help.

“The whole train stopped, more than three TTC staff walked to her, and then she got off the train,” Huang wrote in the video’s description.

TTC told Global News that the woman’s behavior was “awful” and that they “feel for the passengers on board the train who had to witness it.” However, Const. Allyson Douglas-Cooke explained that police spoke to several witnesses and decided to let her off with a warning. Douglas-Cooke also mentioned that the case was forwarded to the OSPCA.

OSPCA spokesperson Alison Cross told Global News that they are investigating the incident but it is “too early to speak to anything.”

[Featured Image: Youtube/Roxy Huang]