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Animal-assisted therapy has many benefits in health care. Yet, its biological and psychosocial effects in the military are unknown, especially for injured, airlifted patients. Researchers teamed up with a non-profit animal organization that trains therapy dogs to see if an animal-assisted intervention could reduce stress in this setting. Results showed that levels of the stress biomarkers cortisol, alpha-amylase, and immunoglobulin A, significantly decreased after a 20-minute intervention with the dogs, regardless of post-traumatic stress symptom severity.