That too. I’ve read about horde tanking and only recall ‘even a shaman with a shield could tank low level dungeons!’ which suggested tanking was a pinch-hitting afterthought for shaman. We’ve had hunters pet-tank low level dungeons when the warrior dc’d or whatever.
I’m an elemental shaman myself, but was thinking of switching to restoration at level 60. People always whispering to ask if I’m a healer, but nobody ever asking if ?I’m a dps or a tank. 
Dps probably common enough, and maybe tanking not expected of shaman.