"Animals as Therapeutic Agents"- The Delta Society has published the following definition of Animal Assisted Therapy:

Animal Assisted Therapy (AAT) is a goal-directed intervention in which an animal that meets specific criteria is an integral part of the treatment process.  AAT is directed and/or delivered by a health/human service professional with specialized expertise and within the scope of practice of his/her profession.  Key features include specified goals and objectives for each individual and measured progress.