Animal-assisted therapy was associated with reduced state anxiety levels for hospitalized patients with a variety of psychiatric diagnoses, while a routine therapeutic recreation session was associated with reduced levels only for patients with mood disorders.

This article provides a review of research published since 1980 on the benefits of human-companion animal interaction. Studies focusing on the benefits of pet ownership are presented first, followed by research on the benefits of interacting with companion animals that are not owned by the subject (animal-assisted activities). While most of the published studies are descriptive and have been conducted with convenience samples, a promising number of controlled studies support the health benefits of interacting with companion animals. Future research employing more rigorous designs and systematically building upon a clearly defined line of inquiry is needed to advance our knowledge of the benefits of human-companion animal interaction.

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This study investigated the optimal time for measuring stress and immune function in 20 healthcare professionals (19 women and 1 man) following interaction with a therapy dog. A nonclinical sample of healthcare professionals was assigned to 20 min. of quiet rest, and 5 and 20 min. with a therapy dog. Serum cortisol, epinephrine, and norepinephrine were collected at baseline, 5, 15, 30, 45, and 60 min. postcondition. Salivary cortisol, salivary IgA, and blood for lymphocytes were collected at baseline, 30, 45, and 60 min. postcondition. Analysis indicated significant reductions in serum and salivary cortisol. The optimal time for measuring serum or salivary cortisol following interaction with a therapy dog was 45 min., with changes in salivary cortisol reflecting serum cortisol changes. Findings also suggest stress reduction in healthcare professionals may occur after as little as 5 min. of interaction with a therapy dog and warrants further investigation.