Okay so I would show a screenshot, but I actually have no idea how to take screenshots. Anyway it's only the canine back mane, and it shows up as pure solid white with no texture. The mane's shape is normal, it's just there's no texture and when I try to colour it it stays the white colour. I've reinstalled the game, played without my modifications, and it still shows up this way. It is only on the canines. I have mane textures in my masks folder. It's left me frustrated for a few hours. If you don't know of a fix for this it's okay.
