The field of Animal-Assisted Interventions (AAI’s) is emerging and developing steadily, however the available literature which addresses this field is limited. This literature synthesis includes 27 articles from this limited pool and addresses what AAI programs exist, how they are being studied, and what the results of these studies are. This synthesis identifies characteristics of current AAI programs, and the methods being used to assess them, and groups findings from all 27 articles thematically. Findings suggest that AAI’s help participants in developing life skills, improve their desire to attend and participate in the intervention, support feelings of non-judgement and the generation of trust within the therapeutic relationship, help to alleviate a variety of symptoms, and are typically cost efficient. Findings also indicate the potential for AAI’s to improve participants levels of sociability and self-esteem but these findings are not consistent across studies. Finally, a number of questions and areas for further research are identified, which will support continued development, and improve effectiveness of these interventions.