i actually loved dogs in world at war espescially when i was lag switching people i would just kill seven people then call in the dogs and lag switch when i saw them attacking the enemy lol. it was the rest of world at war i hated except for nazi zombies that was fine but guns, maps, and weapon damage needed to be better balanced. IW will make a better game so if dogs are in there you prolly have to unlock them at a high rank and thus less of them will be called in per game.
I guess you guys forgot that DOGS were in Call of Duty 4: Modern Warfare. I highly doubt they are in the multi-player but I would assume they are in the single player because it is a continuation of the last game, and they were in the last game.