 The purpose of this study is to evaluate use of service dogs for individuals who have been diagnosed with Post Traumatic Stress Disorder PTSD. Objectives include: 1 assess the impact service dogs have on the mental health and quality of life of Veterans; 2 to provide recommendations to the VA to serve as guidance in providing service dogs to Veterans; and 3 To determine cost associated with total health care utilization and mental health care utilization among Veterans with PTSD. 