Joint supplements are widely used for dogs with arthritis and other musculoskeletal conditions, but evidence quality varies significantly between products and informed choices require understanding the research base.
The welfare case for joint supplements in arthritic dogs is real but must be calibrated to the evidence available for each product. Supplements offer advantages over exclusive NSAID use — they have fewer side effects and can be used in dogs who cannot tolerate NSAIDs. But the evidence quality is uneven, and the supplement industry is poorly regulated: many products contain less active ingredient than claimed. The welfare imperative is choosing products with genuine clinical evidence — omega-3s and green-lipped mussel extract are better supported than glucosamine alone — and using them as part of a comprehensive multimodal management plan that includes weight control, physiotherapy, and appropriate medication. Supplements alone are not adequate for significant arthritis welfare management. The most impactful welfare intervention for arthritic dogs is weight management: even modest weight reduction dramatically reduces joint loading and pain.