A multi-species perspective identifies and offers ethnographic insight into a variety of everyday, practical experiences and the roles they may play in shaping human–horse relationships. Analysis of narrative data from 60 open-ended interviews with a wide variety of riders in Norway and the Midwestern USA identifies three central themes of co-being. These are expressed, felt and voiced as embodied moments of mutuality, engagements of two agentive individuals and as a kind of anthropo-zoo-genetic practice, where species domesticate each other through being together. Co-being as intra-acting describes how horse and human meet and change as a result of their meeting. © 2013 European Association of Social Anthropologists.