Since Legion, any crab pet may be equipped with a special knife (toy) : the Crab Shank, which drops from Pinchshank in Suramar.
A fun addition for the crab family, the hermit crab shares all the same colours as the regular crab model, combined with eight possible shell patterns. This results in 168 possible combinations, though only a small proportion of these are currently available.
A high-quality update for the old crab model, including a bunch of bright new colours.