Animal-assisted therapy (AAT) is a type of therapy that involves animals as a form of treatment. The goal of AAT is to improve a patient’s social, emotional, or cognitive functioning. Advocates state that animals can be useful for educational and motivational effectiveness for participants. A therapist who brings along a pet may be viewed as being less threatening, increasing the rapport between patient and therapist. Animals used in therapy include domesticated pets, farm animals and marine mammals (such as dolphins). While the research literature presents the relationship between humans and companion animals as generally favorable, methodological concerns about the poor quality of the data have led to calls for improved experimental studies.