Therapy dogs genuinely help people with PTSD, but the evidence is more specific than most people assume. Dogs reliably calm the nervous system in the moment and help people stay in treatment. What they have not yet proven to do is reduce the core symptoms of PTSD on their own.
What the Evidence Actually Shows
Research tells a precise story. Contact with a calm, friendly dog reliably lowers acute stress in the moment. Trauma survivors who spend time with a comfort dog tend to show lower heart rate, cortisol, and blood pressure, the ordinary signs of a nervous system settling. Dogs also appear to keep people engaged in care. A 2024 VA Palo Alto study of 45 veterans in residential PTSD treatment found roughly a 20% increase in physical activity when veterans were with their service dogs.
What the evidence has not yet delivered is proof that dogs alone shrink the core of PTSD over time: the intrusions, the avoidance, the constant bracing for danger. A 2022 review of 41 studies on psychiatric assistance dogs for veterans found promising associations, but the field still calls for larger randomized controlled trials.
The Assumption Worth Examining
The VA recommends trauma-focused psychotherapies such as prolonged exposure and cognitive processing therapy as first-line PTSD treatments. Group programs that fold animals into structured trauma care have reported drops in post-traumatic stress and depression symptoms, along with better social functioning. The dog is best understood as an on-ramp: it lowers the activation that makes trauma work feel unbearable, so a person can actually begin. If you are considering a therapy dog program, ask your provider whether animal-assisted sessions can run alongside a first-line treatment rather than instead of it.
