A police officer has been savaged by a Staffordshire Bull Terrier while on patrol in Devon.
She suffered serious arm and stomach injuries outside a house in the Whitleigh area of Plymouth on Monday.
Police dog handlers, a vet and staff from the Dartmoor Zoological Park were called in to sedate the dog.
A 33-year-old woman was arrested on suspicion of having a dangerous dog out of control in a public place. She has been released on bail.
Police said the woman officer underwent a three-hour operation, which is said to have gone well, at Derriford Hospital in Plymouth.
She is expected to be discharged later on Tuesday, but to be off work for some time.
The dog has been seized by police who are considering an application for a destruction order of the animal.
A police spokesman said: "Officers attended an address after receiving reports of a disturbance in the street.
"As police arrived and attempted to walk up the outside path of a property, an unsecured dog from the address ran and attacked officers.
"The dog was only driven off when an officer deployed incapacitating spray at the animal.
"As a result of the attack, a female officer received serious arm and stomach injuries which required immediate hospital treatment."