I'm wondering if any one knows if horses have different blood types such as humans do? if so, it would make more sense to me why some horses tolerate some feed better then others do, the horses origin of decent would defiantly have a Bering on the type of feed that they could tolerate, there must be some type of info out there or, if any one has heard of any such info please let me know. My blood type is O and I can't tolerate wheat, this is common among O blood types, it makes you fat among other things, also for O's most dairy is out, eating according to your blood type makes a huge difference, I have done the research for humans and now I would like to know about horses.