Free-roaming dog 2 (IMAGE) University of Cambridge Caption A significant proportion of the nose or mouth tumours of canine transmissible cancer were found in male dogs Credit Jan Allen/ AMRRIC Usage Restrictions With credit as below 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.