I'm not saying you're not right, but what I am saying is that you're probably emotional right now and looking for someone to blame; the Vet being the obvious choice. Do you KNOW that the vet killed the dog? How do you know it wasn't some sort of neurological problem to begin with?
Again, I'm not saying the Doc didn't screw up (we're all human), but for people to start screaming 'SUE!'........well.........I think that's one of the major problems with our own healthcare system and in part why the rates are so damn high.
All I'm saying is, make sure you know 100% that it was his/her fault before you start pointing fingers.