Were you tanking in a dungeon, heroic, or in a raid?
My rogue can tank dungeons. It's not optimal, but I can do it. My hunter's pet can easily tank dungeons and heroics most of the time (as long as the healer isn't a ****).
Unless you're talking about raids, this is kind of irrelevant. Raids are really the only thing that matter when it comes to tanking because dungeons and heroics are so easy.