: An important field of human–animal interactions is animal-assisted interventions (AAIs), which refers to research on human–animal interactions in order to promote or facilitate health or education in humans. Very few studies among the rich literature on AAIs seem to include aspects of animal welfare and/or animal ethics. Also, very few studies on AAIs have a comprehensive human–animal approach that studies animals, humans, and the relations between them at the same time. This paper tries to argue for and present a possible comprehensive human–animal approach to evaluate AAIs. Methods
: A combination of the species and role approach proposed by Lerner, the capability approach proposed by Nussbaum, and a modified comprehensive human–animal approach to evaluate AAIs proposed by Lerner and Silfverberg was philosophically analyzed. Results
: This paper shows that the combination is the modified role and species version of the capabilities approach, and by following it one could do a comprehensive human–animal approach of an evaluation of AAIs. Conclusion
: Although the aim was reached for horses and animal-assisted therapy, further work needs to be done for all species suggested in the IAHAIO (International Association of Human–Animal Interaction Organizations) White Paper as well as for all branches of AAIs in order to establish this comprehensive human–animal approach.
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