Ms. Kitty goes in Thursday morning to have her left arm removed. I'm dropping her off at the vet at 8am and picking her up between 4-5pm (if all goes as planned, she shouldn't need to stay overnight). They haven't been very forthcoming with how post-op care goes for a three-legged cat, so we'll see how this plays out.
So long, Monster Paw, and good riddance.