And according to the county law enforcement, none of the Rhodens had ever been in trouble with the law. That kind of tells me this incident goes way deeper than originally described. Think of this scenario. Cops knock on the door and are greeted by the people that live there. Are told at the point of a gun to go back and lay in bed and as soon as they do are shot in the head. Might look as if they were shot while sleeping but would explain entry into the house by the killers.
It had to be someone known to both the family and the dogs.