Pig and human (IMAGE) Eötvös Loránd University Caption These findings suggest that the domestication process and intense early exposure to humans alone are not sufficient to trigger human-analog attachment in companion animals. In the case of dogs, the unique selection for cooperation with and dependency on humans might be the key feature for the emergence of attachment to the caregiver. Credit Photo: Sabela Fonseca Usage Restrictions Credit must be given 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.