A specialist search dog working for the armed police force protecting nuclear power stations was put down after it bit an officer, it has been revealed.
The collie-springer spaniel cross was one of only two dogs put down in six years, the Civil Nuclear Constabulary (CNC) said.
The CNC is responsible for protecting nuclear sites, such as Sellafield and Sizewell, and other nuclear materials.
A springer spaniel which had a terminal illness was also put down in 2010.
The information was revealed in response to a request under the Freedom of Information Act.
No other dogs were destroyed between 2008 and 2013, the CNC said.
The force employs more than 1,500 police officers and other staff at nuclear sites throughout the UK and includes counter-terrorism as a major part of its policing operations.