The document discusses how service dogs are used to help veterans suffering from PTSD. It describes how dogs can help lower veterans' anxiety and depression symptoms by tasks like sensing when anxiety levels are rising. The document also explores why dogs are particularly effective as service animals for PTSD compared to other animals, and notes some studies that have found service dogs can help reduce PTSD symptoms and medication use in veterans. It provides several sources used in the document that describe individual veterans' experiences with service dogs.