The Equine Sarcoid: an Update

Introduction The equine sarcoid is by far the commonest cutaneous neoplasm of horses and the risk factors that predispose to its development in an individual have only partially been identified. The disease is becoming more prevalent and yet there is still little interest in advancing research efforts. It affects horses of all ages, although the majority of cases are first presented between 2 and 9 years of age. Sex appears to play no significant role although again there have been suggestions that geldings are over represented. Almost all breeds of horse, mules, donkeys and zebra, are susceptible although there is some suggestion of an increased prevalence in ‘thin skinned horses’. The Quarterhorse and the Lipizzaner are reported to be less susceptible.