I’ve heard speculation that MW4 will be the final MW game and kill off most characters, leading to a Ghosts reboot with Simon Riley leading the Ghost team. In the original Ghosts, IW named the dog Riley as a tribute to the Ghost who inspired the creation of the game, but in this universe, Simon Riley would be on that team, so it wouldn’t make as much sense to name the dog Riley. I think Ghost would name the dog Johnny after his best friend from Task Force 141