It sounds like the fluffy mane mane has now got stripes instead of being all white? Or it's completely invisible?
Stripes could indicate a missing texture, I think. Check that the texture name in the code is the same as the file's name.
If the texture is completely invisible, turn the "alpha_rejection greater_equal" to either 100 or 50.
I've also found an empty gap in the code I posted, it didn't seem to be causing problems in testing, but I've updated my first post to fix it just in case.