A couple of months ago minotaur were given sitting animations, but it appears a bug might be preventing the animation. I had noticed after the update when I logged into my minotaur for a single play session, but have recently begun to un-shelf them and noticed I still cannot achieve the sitting animation.
The PC uses the -Chieftain (Black)- model of minotaur, if that helps. But I was not able to replicate the sitting animation on several of the other models in PGCC as well.