I apologize if this issue has been discussed elsewhere - I searched the forums but couldn't find a thread on this topic.
Most of you will already know that there are a handful of non-combat pets that can't be upgraded with battle stones, family-specific or otherwise, and if you try to do so you'll waste the stone in the process. I did this very thing yesterday evening, wasting 5,000g on a flawless stone to try to upgrade one to get the extra point on my WarcraftPets score. The pet I attempted to upgrade was either a Yu'lon Kite or a Sky Lantern, I don't recall which.
I opened a ticket confessing to my curiosity error to see if I could get my stone back - the GM who replied told me there was "no way to verify" which pet I used the stone on (?) so I wasn't able to get it returned to me. SOL, in other words. Very civil and helpful reply, as always, but I've spent the remainder of the weekend kicking myself for my naivete. I'm not King of the Pet Collections or anything, but I've come far enough to know better.
Is there a compounded list of non-upgradeable pets somewhere, either here on the forums or somewhere else? If not, could we work together to get one started?