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Differential diagnosis of non-parasitic skin conditions in sheep

RECENT years have seen a revival of sheep scab in Britain, the spread of caseous lymphadenitis and the appearance of a new form of footrot. Statistics from the Veterinary Investigation Disease Analysis (VIDA) database show that twice as many diagnoses of ovine skin disease are made today compared with 10 years ago. With shepherds now more aware of the risks of scab, general practitioners are frequently asked to examine sheep with skin problems. Although different skin conditions can appear similar clinically, most are easily differentiated with the use of laboratory tests. This article describes the more common non-parasitic diseases and the techniques most likely to yield a diagnosis.