A 34-year-old woman suffered serious leg injuries when she was attacked by a dog being walked by its owner.
Merseyside Police said the man, who was also walking another dog, just watched while the attack took place in Toxteth, Liverpool, on Saturday.
A police spokesman said the local woman was walking along Roseberry Street when the incident happened.
The dog was either a Staffordshire or Pitbull terrier and the owner was described as black and around 6ft.