Gary Andrews from "Gary the Rat" (2003).

Gary "The Rat" Andrews is a self-centered, misanthropic defense attorney who awakens one morning to find that he has somehow transformed into a giant bipedal rat. Gary struggles to deal with his transformation and hold on to his status as a high-paid, if mercenary, lawyer. Until Gary figures out why he's like this he has decided to try and function the best he can in a "human" world.