A Chorley police officer was seriously injured when she was attacked in her home by a former police dog she had adopted.
The town centre neighbourhood officer needed hospital treatment as a result of the incident, which happened in Chorley.
The dog, a Belgian shepherd called Max, which was forced into retirement just last month after he was mauled by a pit bull terrier while in the line of duty, has been put down.
It is understood the officer, who has not been named by Lancashire police, required surgery.
Max, who was seven, could no longer work as a police dog after he was set upon by the pit bull as he was helping to catch two burglars just weeks ago.
He was bitten in the neck and leg.
The dog and his handler PC Jon Kelly were investigating a reported break-in in Preston in April.
While they were searching for the offenders, a loose pit bull attacked, leaving Max, who spent most of his career working on the Fylde coast, with serious injuries. He needed emergency surgery but was unable to continue working.
PC Kelly, based in Preston, said at the time: “Max was simply doing his job and without any reservation.
“If he had not been present,
“I would have sustained life-changing injuries should the vicious pit bull have attacked me instead.
“He was a dream to work with as he was a natural police dog.
“His work ethic was second to none.”
The pit bull was destroyed at the scene after officers managed to pull it away from Max.
Max assisted in a wide range of operations across Blackpool and the Fylde, as well as in Lancaster and Morecambe, including EDL marches and hunts for suspects who had gone on the run.
He joined the police in 2009, after arriving from Belgium when he was 12-months-old.
A spokesperson for Lancashire Police said: “We can confirm that an off-duty police officer was bitten by a retired police dog in their care.
“The dog had been adopted as a family pet.
“The incident happened at their home address in Chorley on Thursday,
They added: “The officer required hospital treatment for an injury to the face and is currently off work.
“The dog, a Belgian shepherd, has now been destroyed.”