Way back when I was a youngster, and they were Jocko-Redboy dogs, they often referred to as dumb 'ol Jocko-Redboy dogs. You have to beat the hell out of them, as they just keep coming, sometimes just to be coming. They bite hard and they just stay. Dogs wilted under them from time and pressure. Then over time things got better thru selection.
I think the original Red Boy dogs were the same. They had some shortcomings in the beginning and lots of those were corrected and then they were "RED BOY" dogs. Popularity and mass production have left most of them to be 'red boy' dogs. I do not see that as much with the RB-J (JR-B) dogs. EWO