Does it hurt the crab to lose a limb?

I'm guessing they don't feel a thing ;)

There is a debate as to whether invertebrates feel pain:

http://en.wikipedia.org/wiki/Declawing_of_crabs#Pain_and_stress_caused_by_declawing

Per this info, it seems like they do, but maybe it's a case of less pain to get rid of the broken claw and/or even if it is more pain, the claw is useless/sub par, and you would rather grow a new/good one.

Wait, crabs can grow new claws?! Cool!

Yep, that's why it works for them to toss a bad one, not an option for us :(

As a gif:

Reddit comments:

http://reddit.com/r/gifs/comments/229317/crab_amputates_own_injured_claw/