Answer:
Goes over all the hills and hollows. Bites hard, but never swallows.
My first is second in line; I send shivers up your spine; not quite shining bright I glitter in the light.
I am so simple that I can only point. Yet I guide men all over the world.
What is that which, though black itself, enlightens the world without burning?
My first is equality; my second is inferiority; my whole is superiority.
A mysterious, fantastic creature, It has one defining feature, And for humans at their worst, In their eyes it's just a horse