A man has been arrested after a dog attacked and seriously injured another man in a Sheffield street.
Footage of the incident on social media shows the victim trying to fend off the creature and protect his own dog.
The man falls into the road during the struggle before a car pulls up to try and scare the bull mastiff-type dog.
South Yorkshire Police said a 53-year-old man had been arrested on suspicion of having a dog dangerously out of control.
Armed officers were among those who responded to the incident on Handsworth Road at 17:40 BST on Tuesday.
The bull-mastiff type dog is believed to have jumped over a wall to access the road.
It was later caught by police officers and removed from the area.
A police spokesperson said the victim had suffered injuries to both his arm and chest.
The wounds were not life-threatening or life-changing, they added.
“We want to reassure people the dog has been seized and removed while we carry out our enquiries and determine exactly what happened,” Ch Insp Emma Cheney said.
“All incidents of this nature are treated with the utmost diligence, and we will investigate thoroughly to ensure the community is kept safe.
“We would like to thank members of the public and medical staff who came to the aid of the victim, who has been taken to hospital for treatment at this time.”
She asked anyone who witnessed the incident or had dashcam or mobile phone footage to contact the police.