Last spring, North America was gripped in the largest pet food recall in history. News outlets reported tens of thousands of dogs and cats becoming ill, and many dying, as a result of ingesting contaminated pet food. Several pet owners have filed lawsuits against the manufacturers and distributors of the pet food products. This real-life science story can be used with students to show science investigation in action, and to discuss the intersections between the role of regulatory agencies and the public.