Susan- Have they tried a Chiropractor? That would be my next thought. Or, an MRI, if the dog seemed to be in pain. Many human Chiropractors will adjust dogs, if there is not a veterinary chiropractor in the area. It can't hurt and it may help. An MRI, would show more than an xray. Expensive, though.
Good luck to your friends Janice Parky Cape Cod, MA
