Animal-assisted therapy is a goal-oriented, planned and structured therapeutic intervention directed and delivered by health, education and human service professionals. Key features of AAT are: specific goals and objectives are set for each patient, progress is measured, and interactions are documented. The goals are designed by a nurse, occupational therapist, physical therapist, counselor, physician, or other healthcare professional who uses AAT in treatment process. Research examining the use of animals as a complementary or alternative therapy is based on studies about pet ownership. AAT has been shown to be a successful intervention for patients of all ages with a variety of physical and psychological conditions. It can be provided in many settings, including private homes, acute care and rehabilitation facilities, long-term and group care homes, schools, and correctional facilities. The research investigating the impact of AAT on physical conditions has concentrated on cardiovascular disease, seizure disorders, dementia, and pain management.