Nothing is working for my arthritic Springer Spaniel — what next

Two years and three supplements with no visible improvement — I want to give you a straight answer here, which is that at this point the evidence is pointing toward the arthritis being beyond what OTC supplements can manage. Before I suggest a fourth product, tell me which three you've tried and whether any vet imaging has been done.

Moderate bilateral OA with a non-response to three different supplement mechanisms over two years — that's a clear picture. The honest answer is that I'm not going to recommend a fourth OTC supplement, because there isn't one that will do what two years of the above haven't. What I would do is go back to the vet specifically to discuss Librela. It's a monthly injectable monoclonal antibody that targets the pain pathway in a way supplements cannot, and its approval in the UK specifically has changed the management picture for dogs in exactly his situation. There may also be a case for repeat imaging — 18 months is a long time with active OA and the clinical picture will have changed. I know that's not the answer you came for, but it's the right one.