>>52999038I maintain that it isn't a tail, but rather fur that's being torn off.
Those red spots? Those are wounds that have JUST healed over. You know where all of those weird flowing bits of fur are found near? Those wounds.
Unfortunately I can't prove to you that it's not a tail because APPARENTLY no one has EVER taken a picture of the backside of a Hisuian Zoroark, and I don't own Pokemon Home nor PLA to prove this.