Buttercup is Mrs. Wilco's pet cat. She is shy, but aggressive. Mrs. Wilco, who had adopted Rob's vegetarian lifestyle, took it to a level Rob hadn't (and definitely wouldn't consider) with Bucky, and started feeding Buttercup vegetarian cat food. Buttercup asks Satchel to kill her, and just before they leave, Buttercup attacks Rob, begging for tuna. Rob gave Buttercup $400 and a Buddy's Barbecue take-out menu, from which she ordered "15 #5's with extra pig". It is unknown if she is Francis' cat as well.