Train (IMAGE) Washington University in St. Louis Caption Train, a Chesapeake Bay retriever, was trained to sniff out animal scat after being rescued from the Humane Society. Credit Photo: Courtesy of Karen DeMatteo Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.