Taluwen wrote:The only demon-like thing we tame is the blighthound and it's only one color.
Still clearly demonic what with the burning flames on paws and mane
We can't tame the blues because they're classified as demons.
Classification can change very easily
Hell Boars currently are untameable but they aren't demons either.
These are demonic creatures and we will be able to tame them in cata.
Also those ghost spirits? They're called SPIRIT BEASTS for a reason.

Not ghost sabers or ghost howl (or ghostly jormungar for that matter)
Even setting them aside, spirit beasts nonetheless are very clearly supernatural and not just beasts.
So we don't tame demons or elementals.
Demons were covered above; as for elementals how else would you classify a creature made of lava (corehound) or a configuration of floating rocks (shale spider)
A creature's current species tag only means Blizzard doesn't currently want us to tame that particularly creature, however from a conceptual standpoint it's already been demonstrated repeatedly that having been raised from the grave or called from another plane is by no means a categorical bar against it being a hunter pet... if not now, then later on.