Sarcoids should never be underestimated. My professor at University once told me the only thing predictable about a sarcoid is they are unpredictable! Although most sarcoids can be treated with a fairly good success rate it would be foolish to make this assumption without considering the facts. Approximately 8% of horses in the UK suffer from sarcoids and while they rarely lead to death they can become so debilitating that euthanasia is necessary.