A growing body of research supports the notion that human well-being is inextricably connected to the welfare of other animals. Social scientists are exploring these connections in research in social work and various subfields of sociology, including those focusing on the environment, deviance, the family, health, social inequality, and religion, as well as the emerging field of animals and society. This special issue taps researchers and theorists from several countries in a wide range of subfields in order to capture the breadth of the connections among species that affect all aspects of human well-being. This is a double issue, as we received such a large number of submissions that covered a variety of issues. The Humane Society University graciously helped subsidize the expansion of the issue to include the additional content. In addition, I need to thank the wide range of people all over the world who helped review manuscripts, despite their busy schedules.