Immune-mediated polyarthritis causes painful inflammation in multiple joints simultaneously, representing one of the more challenging chronic pain conditions in dogs requiring careful long-term management.
Dogs with acute IMPA present in significant pain — the simultaneous inflammation of multiple joints causes diffuse musculoskeletal aching that prevents comfortable movement, rest, or play. Fever compounds the discomfort. Before diagnosis, dogs may be treated symptomatically for weeks while the systemic nature of the condition is missed. The high-dose immunosuppression required for treatment carries side effects including polydipsia, polyphagia, and susceptibility to infection. Relapsing cases face repeated cycles of painful flares and immunosuppressive treatment. The uncertainty of prognosis — whether a dog will achieve durable remission or face lifelong relapse management — creates ongoing welfare and owner anxiety. Rapid diagnosis and aggressive pain management minimize the duration of acute suffering.