 And a new study at the University of Arizona is proving that veterans with service dogs have fewer PTSD symptoms and a higher quality of life. The study involved 156 service members, half of whom were paired with a dog. Veterans came back and said their quality of life was better and they had lower levels of depression and anxiety. Rescue dogs and shelter dogs were used for this. And researchers say that no breed in particular did better or worse than others. Researchers would like to expand the study.