Wolf Pup (IMAGE) University of Massachusetts Amherst Caption Differences in timing of snsory development during the critical period of socialization in wolf and dog pups may help to explain why wolves are difficult to tame while dogs are not. Credit Kathryn Lord Usage Restrictions None 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.