A policewoman has undergone surgery after suffering serious arm and stomach injuries when she was savaged by a dog.
The officer was responding to reports of a disturbance in the Whitleigh area of Plymouth when she was attacked on Monday afternoon, Devon and Cornwall Police said.
She was walking up the outside path of a property when the dog, believed to be a Staffordshire bull terrier, ran from the address and set on her, police said. Another officer used a spray to incapacitate the animal.
Specialist dog-trained officers and staff from Dartmoor Zoological Park and Estover Veterinary Hospital went to the scene and sedated the dog.
A police spokesman said: "The officer has undergone a three-hour operation - which is said to have gone well. She is expected to be off work for some period of time.
"The dog has been seized by police and will undergo assessment to establish whether it is a banned breed. Police are considering an application for a destruction order of the dog."
A 33-year-old local woman was arrested on suspicion of having a dog dangerously out of control in a public place. She was released on bail until September 16.