I'm a bit rusty when it comes to the presets since it has been awhile-
If the head is showing up just fine then maybe it's the body that's specifically coded incorrectly. If I remember right, there's suppose to be a 'preset' in front name on that .png line. So it'll be texture MongooseDog.png, all white means mixing texture.
You can check the head section of the preset since it's loading correctly and compare the two and see if there's anything missing. If I'm wrong I don't mind being corrected but hopefully it's a step in the right direction!