Not all Dogs of War units should be available to all armies. I'm not sure if there are some limitations currently implemented but here you can find comprehensive lists of each unit and what it counts for in each army:
http://us.games-workshop.com/games/warhammer/gaming/dogsofwar/assets/dogs_of_war.pdf
http://us.games-workshop.com/games/warhammer/gaming/dogsofwar/assets/reg_of_renown.pdf
For example Cult of Slaanesh shouldn't have access to any other DoW or RoR unit than Manflayers. There are quite severe problems with other SoC too.
http://us.games-workshop.com/games/warhammer/gaming/dogsofwar/assets/dogs_of_war.pdf
http://us.games-workshop.com/games/warhammer/gaming/dogsofwar/assets/reg_of_renown.pdf
For example Cult of Slaanesh shouldn't have access to any other DoW or RoR unit than Manflayers. There are quite severe problems with other SoC too.