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JACKSON (1936) first described equine sarcoids, which are locally aggressive, fibroblastic tumours of equine skin. They are often multiple, frequently recur following surgical excision or radiotherapy, and generally have fibropapillomatous features. Horses, donkeys and mules are susceptible. Jackson (1936) pointed out that the gross and microscopic appearance of the tumours, the predilection sites, and the pattern of spread to secondary sites on affected animals were suggestive of a viral cause. A recent report of transmission studies by Voss (1969) supports this view, and Olson and Cook (1 951) have presented evidence to implicate the bovine papilloma virus.Although equine sarcoid is probably the most common skin tumour of horses (next to the self-limiting viral papillomatosis of young horses), it has received but little attention and there has been little progress in our knowledge of this important disease.

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