Dog chiropractors (certified by the AVCA) are not at all like human chiropractors. It's a totally different approach and type of adjustment. My vets (who are certified) can tell when there is a serious problem or a fixable problem.
Many times they suggest an xray before proceeding, and sometimes when they notice a change, they ask me to get an xray.
Usually vets underdose tramadol which is probably why it appears not to work. On a large dog, 100mg every 4 hours is not a big dose.
I believe Trudy said tramadol is what Ryan is on