Book excerpt: The Waltham Book of Human-Animal Interaction: Benefits and Responsibilities of Pet Ownership discusses the scientific study of the relationship between man and animals, focusing on the behavior of companion animals, and how humans and animals affect each other's behavior. This first half of this book discusses research on benefits that have been found to accumulate from associations with animals, and the role of animals in care and therapy program. The responsibilities toward the animals kept, and how to enhance their care and welfare are considered in the next chapters. The human response to pet loss is also elaborated. This publication is beneficial to veterinary students and individuals concerned with the study of human-animal interactions.