I was
finally able to unpack the files in the item folder, and it just so happens that some of the pet doll models had SKINS already on them! I took screenshots and I'm posting them, just in case anyone needs them for a guide or something. This isn't a complete list at all. More than half of the pets either didn't have textures or didn't have an animation, so they were unusable atm.
Mini Ghost Pet
Mini Hina pet 1
Mini Hina pet 2
Mini Hina pet 3
Mini Keby(NOT Kebing lol)
Mini Keby 2
Mini King Crab
Mini Musa(wtf? lol)
Mini Phino
Mini Ratman
Mini Stoney (looks like a tree to me, but eh...)
That's all that I have so far. I'll see if I can open anymore.