This manual describes the Human-Animal Interaction Scale (HAIS), a self-report instrument designed to measure interactions between humans and animals. This manual describes the HAIS development and its psychometric properties, as well as its use, administration, scoring, and interpretation. It also includes forms for administering the HAIS. The HAIS has broad applicability; it can be used in a variety of settings (e.g., research, animal-assisted therapies and activities, animal sheltering and advocacy) and with a variety of species (e.g., companion animals, small caged animals, large pets or farm animals).About the Author: Angela Fournier, PhD, is a professor, researcher, and licensed psychologist. She is dedicated to advancing the field of human-animal interaction in academic and clinical pursuits. As a professor in the Department of Psychology at Bemidji State University, she teaches students the psychology of human-animal interaction in the classroom and serves as Director of the Human-Animal Interaction Laboratory. Dr. Fournier has authored over 20 peer-reviewed journal articles and book chapters, and is a member of the International Society on Anthrozoology. As a licensed psychologist and certified mental health specialist with the Equine-Assisted Growth and Learning Association, she co-facilitates equine-assisted psychotherapy and learning at Eagle Vista Ranch and Wellness Center in Bemidji, MN.