Mouth Licking With Avoidance (video) University of Lincoln Share Print E-Mail Loading video... Caption During the experiment, dogs were shown an image of an angry human face, and their response was recorded. This shows one canine participant looking at an angry expression, licking its mouth and making a move to back away. Credit Natalia Albuquerque Usage Restrictions For use in media work only. Share Print E-Mail 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.