I have approximately 50 war dogs. Most are no longer assigned to anyone. If my dwarves enter combat anywhere on the map (siege on the surface, demons/angels 80 levels below, doesn't matter where), War Dogs will start to attack friendly visitors (bards, scholars, barons) until dead. Visitors rarely fight back, they mostly run/avoid contact. The War Dogs can be anywhere in the fort and nowhere near the combat. Military Dwarves getting in combat with a single hostile target near the edge of the map will immediately trigger dogs inside the fort to start attacking friendlies and usually ends in dogs killing a few bards/barons of usually the same civilization.

Updated with Installed_mods folder.
Also Steam DFHack.