You can use any shader on the tail but I use XS Fur because it's a prime fur shader. Please use the toon shader in the link provided above otherwise use a new one if you're reading this at a much later date. It will still work fine with any version after Toon 3.0. Doesn't require a modded SDK!
Finally, an avatar that doesn't look like a fucking slut. Srsly though, RustTV, Larens, Yuumi and all these other slut makers ruined VRC with their low effort copypaste models, there's no originality anymore.