When police officers are shot and killed, it affects other people on the force as well as their families. Police officers who have lost their partners on the job will often mourn for them. As this video demonstrates, nonhuman members of the police force will mourn their partners just as surely.
During the funeral of a fallen police offer, his police dog actually reaches out and puts his paw on the coffin in a particularly touching scene, which helps demonstrate the bond that the two of them had as well as the level of awareness the dog had about the gravity of the situation.
The dog at least got to enjoy a happy retirement in the arms of loved ones. This touching video does a good job of illustrating many different things about the nature of friendship and police work. Many people on Facebook would find this video particularly touching and sad.