May the Best Pet Win!

Pets had become quite popular in Ponyville, almost every pony had one, every pony except for Rainbow Dash that is. Rainbow just didn't see the appeal, besides, how would she be sure that she'd get the best pet a pony can get? Though she did feel a little left out, she'd always see her friends gathering somewhere or other for a pony pet play date, which was always interesting to watch. In a way, Rainbow Dash was glad that it had been clarified that there were two different types of pet, the "aw-what-a-cute-little-animal" pet and also the "this-pony-is-so-sexy-I-want-to-make-her-my-sex-slave" kind of pet, the latter of which being the most recent trend in Ponyville.

Rainbow Dash knew that she wanted one of her friends to be her pet, there was no rule against someone who had their own pet becoming a pet, but how was she to decide who?