rsbm.Which brings up a point. The dog is the witness. I can’t shed the feeling that she should somehow react to the killer. The fact that MLA disappeared so rapidly is raising many questions. Anyhow, I hope that the police finds the way to check the dog’s reaction to the people around her.
I think I remember seeing an old Columbo tv show where the dog fingered (pawed?) the murderer.
But, outside of detective fiction, has it ever happened in real life? No offense to dog lovers, but I don't see how this could be in any way useful. The dog could be reacting to any number of things...it may be sensing the accused's fear; or it just may not like the way a person smells; or maybe they had some past negative interaction unrelated to the murder.
I would imagine any attempt to use a dog to identify the perpetrator would get laughed out of court and perhaps even taint a future prosecution.