Flatcoated retrievers (IMAGE) University of Cambridge Caption Two-thirds of all flatcoated retriever dogs have the POMC mutation. Dogs with the mutation tend to overeat because they get hungry between meals more quickly than dogs without it. Credit University of Cambridge Usage Restrictions With credit License Original 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.