<qa>  What is the purpose of this study?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. 