Random mob skins stopped showing up

Hey! So I made this pack not long ago, and everything was working well and fine! But over the weekend, out of nowhere while I was working on a different pack, everything broke. All my custom item textures stopped showing up, and I didnt notice this triggered a direct reaction in my wolf pack too, until later that night. The basic brown wolf skin shows up and they still respond to naming a dog "blue" however, the variations don't show up nor for me or anybody else. I've done everything I can think of, reconfiguring my mcmeta file, switching around the folders, deleting and actually remaking the folders, putting the skins into a different pack to see if they'd respond there, I even completely remade the pack from scratch. Nothing is working. I have my random entities enabled in my optifine and other random entity packs run fine, it's just the wolves.

So I need help figuring out what the heck is going on here, and how to fix it. Any advice is greatly appreciated- I've been trying to fix the issue for two days and I'm at a loss now, the only other thing I can think of is that the actual texture files have gotten corrupted and refuse to work now, somehow.