In almost 30 years of horse ownership, started with saddle horses, minis for the last 10-11 years; I've only had a few minor colic episodes and one major, a couple of the minor ones turned out to be ulcers. My major colic episode was while I was in college and boarding my horses, so they weren't in my care, my then 3 year old mare impacted a couple feet of small intestine, she had surgery, recovered and eventually went on to have a couple of foals and live into her 20s (I sold her in her midteens, but she was still going after that for a few years, at least before I lost track). The minis have just had minor colics that walking took care. [guess there was one more major colic, but likely a strangulating limpoma (sp?) in an aged half-Arab gelding, it took his life, he was 27 years old.]