Thanks so much! I hadn't really thought about it either, but it was very fun making it work. (Points fingers at for making me do it :-).
The research for this was really interesting, and I'm definitely going to be making a post about it. Turns out "ponyplay" and "petplay" are in many ways replacing the "Master/Slave" play in the world of folks who do that. Because people see owner/trainer/pet relationships in their everyday life, and they don't see a lot of masters and slaves walking around these days -- or at least that's the theory!