Lameness can be caused by lyme disease, thyroid problems as well as hip, back,neck and or shoulder issues, not to mention elbow, knee and paw issues, WOW!
Yes there are lots of causes, if u have been to your vet to rule out lyme and thyroid then a canine chorractor is needed. Be sure the chiropractor is certified by the american vet chiropractic assoc.
A subluxation within the joints and or the spine can change muscle function and thus lameness.
Chiropractic adjustments as well as exercises, cold laser and sometimes wt loss will help correct the problem.
Contact Dr Bruce at 781-337-1180 or Indekchiropractic@gmail.com