Dogs of War had their last own army book in 5th edition. I\'d try getting it (on ebay maybe), cause it does have quite a bit of fluff about the DoW and Regiments of Renown.
The Army List and Regiments of Renown updated for the site are 6th edition IIRC, so I\'m not sure whether they are legal for 7th. (Is there a list in the back of the BRB?)
Additional Regiments of Renown sometimes pop up (mostly for some campaigns), and are then cowered in WD, and possibly the site as well.
Note that pretty much all of the Ogre Kingdoms List is usable as DoW in another army\'s Rare choices or a DoW army.
Hope that helps.