French Mastiff (or Dogue de Bordeaux) as my model for about half the dogs. One is a reddish brown that I thought looked cool but doesn't really match any specific bread.
Italian Mastiff I imagine that these "soldiers" help keep the perimeter of military camps safe and guard the flanks against ambush. Dogs will often detect hidden men the even the most diligent human scouts would miss. I don't imagine they take too much active part in battles but I would probably rate them as irregular cavalry in Maurice. I suspect these dogs and their rifle armed humans could provide a nasty surprise in the right situation. I also imagine they chase down deserters and maybe help guard prisoners.