In its twelfth year, the 9/11 Medical Surveillance Study continues to follow the surviving dogs. Of the initial group consisting of 95 deployed and 55 non-deployed search and rescue dogs, 9 deployed dogs and 12 control dogs remain. As these dogs age Dr. Otto will be placing emphasis on health issues occurring in later years of life. Dr. Otto’s goal is to obtain a complete picture of causes of death and incidences of cancer so that the long-term impact of September 11th will become visible. This vital information will provide the most inclusive understanding of the impact of the deployment on long-term canine health and will be critical to the future tactics employed in Search and Rescue missions.