Dementia is one of the greatest challenges facing humanity in the 21st century. Responding to the global dementia challenge, however, affects more than humans alone. We live in a multi-species world but often think about dementia in mono-species ways. From the lab to the living room, other beings are “on the scene” and our relations with them affect how we understand, experience, and respond to dementia. Drawing on cutting-edge work across the social and biological sciences, this book offers readers the tools to respond to dementia in multi-species ways. By exploring a range of topics, from pathology to personhood, contributors highlight how thinking about dementia as a more-than-human phenomenon may enable new ways of responding to our global dementia challenge.