This paper chronicles students' experiences of transformative sustainability learning through "epistemological stretching"--a pedagogical orientation which focuses on expanding the ways of knowing that someone respects, understands, and/or engages with. With a particular emphasis on decolonizing relations between humans and the more-than-human, epistemological stretching enables students to articulate and critically engage with the epistemologies of their academic fields, gain new (old) perspectives on relations with the more-than-human, and interact with Indigenous knowledges in more effective and ethical ways. Students in this study experienced powerful learning outcomes in the following areas: reconceptualization of relationships, acknowledgement and deconstruction of power, and worldview bridging. Some students also received validation for ways of knowing that they previously engaged in but were unsure about expressing in academic contexts.