The other day, while attempting to snipe an enemy, Dogmeat kept stepping in my way, so I told him to wait, out of the way. After all the action was over, I went and collected my loot, and went on my way. Without Dogmeat.
Fortunately, I remembered where he was, I managed to retrieve him. However, if this happened again, how can I locate Dogmeat, or any of my other followers, diligently waiting for my return?