Both our dogs have back issues. Acupuncture/chiropractic treatments every 2 to 6 weeks have kept them going quite well. One has lumbo-sacral stenosis (LS) and has managed really well for two whole years, no meds required. (LS is basically a progressive narrowing of the place where the nerves run in the lumbosacral area, thus pinching the nerve.) The internist recommends treatment with adequan, rather than depo medrol, when it has progressed enough to need that kind of intervention, which it will inevitably. The other dog had a racing injury, a dropped gracilis muscle in his right thigh. Now the left hip is dropping, probably in compensation, four years later! He has had problems all along, but we didn't know what it was until the left hip visibly dropped. Meanwhile, the a/c treatments got him through the past two years. He is starting now to need tramadol and a muscle relaxer (methocarbamol).
Acupuncture and/or chiropractic -- we have both done at the same appointment -- are not entirely cheap. But they can keep a dog going years beyond what medicine alone can do. Not telling you what to do , just sharing our experiences for what they're worth.
There's a simple test for LS that involves the vet just pressing gently on the back and seeing if the dog's back end sinks in response. (See vet Suzanne Stack's stuff about it on the internet.) Did your vet do that? In any case, best of luck to you and Bill. And, oh yeah, I think "concerned" owners are the best!