Wolves Eating a Carcass Together (IMAGE) University of Veterinary Medicine -- Vienna Caption Low-ranked wolves often defend food against their high-ranked partner. Dogs don't. Credit Photo: Rooobert Bayer Usage Restrictions This photo may only be used in the context of this press release. 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.