>He was never fed much grain I tried to avoid grains most of his life. Not sure whether that would of had any bearing in his situation.
I'm not sure either, but I was reading up on it and it seems to be a genetic thing in horses - a recessive gene. So, in horses, a certain gene means they can be born with adverse reactions if fed grain, effects seen after exercise. It could turn out to be different in dogs though - as you say it seems to be rare (academic papers online seem to refer to one case in an 11 yr old English Setter).
I am also left wondering, as a friend of mine has a young cat diagnosed with feline pancreatitis, which in cats seems to be about processing carbohydrates (something that cats have no need for in the diet anyway as they are obligate carnivores). It does make you wonder if years of feeding biologically inappropriate foods to animals might be bringing this about, or at least highlighting individuals which can't tolerate it.
Run free Ollie - I hope the condition that shortened you life can be better understood in future.... I hope your case will contribute towards knowledge of this condition in dogs.