The reason no one has done a proper cat is simple. You can't get one to sit still long enough to draw on the patch edges, of course. I'd like to add that no one's done a dragon with legs that don't look goofy either. Ever wonder why? Most fantasy artists use cats' legs as the basis for their dragon legs, modified to fit on the serpentine bulge of a dragon torso. The problem with cats is pretty much the legs.