Considering how my species probably evolved, they seem to be a slave species of humanity, a human sub-faction or a completely different race.

Whom have lost control of their loyal attack dogs, literally. :P

I can start writing and fill in the blanks later.
As for more species than the Schäferkin, i'd say it doesn't make sense to have other major sentient lifeforms that have evolved alongside them.
I'd also claim that Schäferkin is a very young species. They have overtaken their planet from previous lifeforms. An ancient and wise civilisation so to speak :P
(Don't worry, they'll make sense.)

Pm or thread for putting up sheets for inspection?