A dog attacked a 63-year-old woman as she tried to fend it off with a shopping trolley.
The woman was in Orchard Avenue Recreation Ground in Hackbridge when the dog, understood by Sutton police to be named "Barney", attacked.
She was bitten on her right thigh before a member of the public intervened and pulled the large short-haired black dog, around the size of a greyhound, off her.
Following the Tuesday, December 9, attack at 10.20am, Sutton police launched a witness appeal to trace the dog's owner.
She is described as white, aged between 20 and 30 years old, with short brown hair. At the time of the attack she was wearing a blue jacket.
Police would like the owner of the dog to come forward and to trace the member of the public who came to the 63-year-old's assistance.
If you have any information to help police, contact Sutton police station on 101 quoting reference number: 4013201/14 or Crimestoppers anonymously on 0800 555 111.
Comments: Our rules
We want our comments to be a lively and valuable part of our community - a place where readers can debate and engage with the most important local issues. The ability to comment on our stories is a privilege, not a right, however, and that privilege may be withdrawn if it is abused or misused.
Please report any comments that break our rules.
Read the rules here