Police in Cumbria are hunting the owner of a dog which attacked a man in Barrow.
The man, who has not been named, but is in his 20s, needed surgery after the attack by the Staffordshire Bull Terrier.
A spokesman for Cumbria Police said the animal was being walked by another man at about 2000 GMT on 23 December, when the attack took place.
The spokesman said: "The man was walking along Bath Street in Barrow, when he was approached by another man who was walking a Staffordshire Bull Terrier.
"Without provocation the dog attacked the young man.
"He was taken to Furness General Hospital in Barrow where he needed surgery for serious injuries to his leg."
Police have appealed for anyone who was in the area at the time to contact them.