I saw this thread and it is the same problem that I have at the moment on my Private Server. http://www.gamerzplanet.net/forums/world-of-warcraft-private-server-discussion/132049-hunter-fix.html
The only thing is that I can't seem to find the mangoscript.dll file.
Im using the Lbniese Repack 2.9 and Ive updated it multiple times, but I can't seem to find how to keep the Pet we tame when we log back in.
Please Help

Actually, I don't use Mango. I use HeidiSQL.