1. Nancy R. Gee, Department of Psychology, State University of New York, Fredonia, New York, USA, and WALTHAM Centre for Pet Nutrition, Leicestershire, UK
2. Department of Clinical Sciences, Cummings School of Veterinary Medicine at Tufts University, USA; Tufts Institute for Human–Animal Interaction; Jonathan M. Tisch College of Civic Life at Tufts University, USA