Zach is the reason I became an animal chiropractor.  When he was 14 he woke up one day and was unable to move his hind legs.  The vet tried therapeutic laser and steroids which helped some but it wasn't until he had an appointment with a vet that was certified in chiropractic that Zach was able to ambulate well.  Zach lived another 2 years until he was almost 16 years old.