Not only does Drrum (found through warcraftpets) show us artistic screenshots of pets on Papa Hummel's Biscuits (which make pets grow very large) but she(?) also includes a list of all clothing in the screenshots.
So if you're looking for a cool pet or an RP set, look no further than Drrum's gallery.
Even if you don't care about the details of the screenshots, the screenshots themselves are artistic and worth viewing. Drrum put a lot of time and effort into these.