How to create game ready fur?

What is the best way to create realistic fur texture for a creature such as a werewolf to use in game?

I see people talking about using hair cards, but is there a good way to cover an entire body with those cards and still be able to comb it and what not?

I can't find any information at all about doing this in Blender. I just get results for using Particle hair for it but that is not possible for something that is going inside a game engine, or I get information about Fibermesh in Zbrush.