1. School of Health and Life Sciences, University of the West of Scotland, Scotland, UK
2. School of Health and Social Care, Edinburgh Napier University, Scotland, UK
3. School of Education and Social Sciences, University of the West of Scotland, Scotland, UK
4. Centre for Human–Animal Interaction, School of Medicine, Virginia Commonwealth University, Virginia, USA
5. Waltham Petcare Science Institute, Waltham-on-the-Wolds, Leicestershire, UK