For anyone familiar with 3d modelling, I believe you can import the wolf and skellie models to apps like 3ds max and edit them, save them as the same name as original, and export it back to the containing folder. You would have to save a zip of the new model, as after patching your edit may get overwritten.
I have experimented in 3d studio max for years and I also made EQ mods for my personal server. None of the content I made will ever be added here, so please do not ask. But like I said, people familiar with 3d model apps/studios could edit their own models and export them to the eq folder.
I don't know how well that will work on SoD, and I don't know if that is allowed or not. You might want to ask a GM or someone if you are allowed to modify base models and things.