This study will examine how animal-assisted therapy (AAT) affects aspects of pain. It will explore the possible benefits of the National Institutes of Health's AAT program on distress in cancer patients receiving pain and palliative care at the NIH Clinical Center. A number of studies on the benefits of patients interacting with companion animals have shown a positive effect of both pet ownership and AAT for patients with chronic illness. However, few such experimental studies have been conducted with cancer patients.