I think it probably has more to do with play and communication style than anything else. I know Meg has a "type" of dog that she vastly prefers over others, even though it isn't her breed. I've gotten better at knowing what dogs she will and won't interact with well over the years. She's generally a big fan of herding breeds, who often play without a lot of physical contact, which scares her. She loves the play-bow/turn and run sort of games. She actually got playing today with a beagle mix who played like a herding dog today - not a breed she normally enjoys interacting with, but her 'type'.