Siberian Dog Skull (1 of 2) (IMAGE) University of Arizona Caption A profile of the Siberian dog skull shows the shortened snout and crowded teeth that helped scientists determine this ancient animal was domesticated. Credit Nikolai D. Ovodov Usage Restrictions This visual may only be used in conjunction with reporting/posting of this news release. Image/video credit must be included exactly as indicated. 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.