This work examines a relational ontology with the focus on our relationships with the more-than-human world. The aim is to investigate a subject that is more suitable to face the challenges of our times. Inspired by the posthumanistic project as presented by Rosi Braidotti I propose a non-anthropocentric reading of Martin Buber’s I and Thou. In the first section of the essay I present an overview of Buber’s understanding of the subject and I also answer the question whether we can consider the I-Thou relationship to include the non-human world. In part two I investigate the characteristics of such a relationship, covering as well the act of dialogue. This opens up for a new understanding of the subject as constituted by relationships including non-human others. As an example of how to protect living I-Thou relationships with non-human others through the I-It logic of law I present the case study of the river Wanganui in New Zealand and its newly acquired status as a subject by law. Finally I conclude by discussing a possible ethic where relational capacities are key.