http://everquest.allakhazam.com/history/patches.html
This should help. I dug around but couldn't find anything but that's not to say it isn't there. It's a lot to control+f through.
This is starting to make a little more sense now. I still think Animations were meant to have a different rule-set than other pets since there is no way to control them.
EDIT:
It seems odd that the predominant crowd control class should be equipped with the "absolute worst possible mez breaking nightmare machine".
As it works now when I have to mez an add I simply root it and when mez wears off i just get close enough to get hit once and my pet takes over.