Merck Manual

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Polyarthritis in Dogs and Cats


Joseph Harari

, MS, DVM, DACVS, Veterinary Surgical Specialists, Spokane, WA

Last full review/revision Nov 2020 | Content last modified Mar 2022

Clinical signs of a polyarthritis include fever, lameness, swollen joints, lethargy, and inappetence.

Treatments involve longterm glucocorticoid therapy or other immunosuppressive medications such as azathioprine or cyclophosphamide.

Prognosis in most cases is guarded or poor, with relapses common.

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