A woman needed surgery after a dog attack in a Rotherham park.
She was then bitten by his dog, suffering a serious arm injury, which required surgery.
The owner of the dog left the park before police officers arrived.
He was Asian, about 20-years-old, tall, slim and had facial stubble. He was wearing a black and red shell-suit style jacket with dark blue jeans.
The dog was a white and grey Husky or Akita type breed.
A South Yorkshire Police spokeswoman said: "At about 9.35pm on Tuesday, June 28, a 40-year-old woman was walking through Bradgate Park when an unknown man, who was walking his dog on a lead, approached her to ask a question.
"The dog then reportedly bit the woman, causing a serious injury to her arm. The woman was taken to hospital following the incident where she underwent surgery.
"She has since been discharged from hospital and is recovering at home.
"The owner of the dog left the scene before police were called and officers are now asking for the owner of the dog to come forward, and for your help to identify them.
If you have any information about what happened, or know who the owner of the dog could be, please call."
South Yorkshire Police can be contacted on 101 or information can be passed to Crimestoppers, anonymously, on 0800 555111