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.