"Theology" presented to the Equine and Farm Animal Hospital at Cornell University for evaluation and treatment of infected right hock joints. Arthrocentesis, bloodwork, and radiographs were used to diagnose infectious or septic arthritis. Despite aggressive surgical and medical management, osteoarthrosis and osteomyelitis developed in the affected limb, and supporting-limb laminitis developed in the contralateral limb. Due to a poor prognosis for survival, Theology was euthanized. Necropsy was performed and confirmed the diagnosis of septic arthritis.