Labradors are highly food-motivated dogs (IMAGE) University of Cambridge Caption A quarter of all Labradors have a genetic mutation that triggers a starvation signal in their body, making them feel hungry all the time and burn off fewer calories. It’s very difficult to keep these dogs slim, but it can be done. 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.