However, both the main and tail are hair pieces, so any hair-savvy PA can make more natural and/or versatile ones.
I’m working on dynamic hair mane, tail, forelock and fetlock for Poser. They are for my own project but will be available for other when done. I have 40 horses in our project and they will all have their individual look from Friesian, thick, curly and long to silky arabian mane and tail and everything in between. So far it looks fantastic in animations.