Suitable mount for dwarf cavalier or samurai

[mjmeans]

So I'm reading the rules for mount and says the mount has to be one of suitable size and goes on to list camel or horse for medium sized characters. But for a dwarf who has lived primarily inside a mountain mining community, mining for mithral, gold, gems and other goodies, it doesn't make sense to use a surface animal such as a horse. Is there any enabling rule that would allow a dwarf to choose more suitable animal types that live underground or in caves (lizard, badger, snake, etc.) and/or to be able to apply the cave creature template and/or a cave creature variants of stronger medium sized creatures (velociraptor)?

Also, since mining dwarves live mostly underground shouldn't their mounts also be some animal type that has darkvision?

[Victor Zajic]

I think the Beast Rider Archetype is legal for society play. That's pretty much the only way, beyond special rewards on chronicle sheets, for a samurai/cavalier to get a mount beyond horse/camel if they are medium sized.

This question has come up often, and the campaign staff have answered it clearly.

There is no way to add the Cave template to an animal companion.