OK i don't think it was a RR thing"? To me it's just a badly behaved dog thing! The owner clearly has no idea of what his dog does and no control over his dog!
His dog is basically a" dogfight" looking for a place to happen! When JQP comes in with his Dominant male/female (insert breed here) dog he can get the chance to try this:
Leerburg | How to Break Up a Dog Fight Without Getting Hurt!