How can horses eat peanuts without choking?

Horse's esophagi are much, much wider than humans. One at a time, peanuts wouldn't be large enough to block their throats. If they did manage to get a clump of peanuts stuck there (which would be hard as peanuts don't stick together) then yes, they could choke, but this would be easily fixable. read more

When horses choke they are still able to breath, but not eat. If you noticed your horse was choking you could remedy it by assisting with removal of whatever was blocking their esophagus (and by assisting I mean calling a vet to assist. read more

Many owners associate peanuts with allergies in humans, however there is very little evidence to suggest that horses can suffer from peanut allergy. Despite this we still strongly recommend against feeding your horse peanuts. read more

I am a vet, but I'm unaware of any research on negative effects of peanuts on horses. I feed them (shell and all) as an occasional treat to my IR horse. It's low in NSC, relatively high in Mg, and no more fibrous than anything else horses are meant to eat. I would imagine, in large quantities, a horse could choke (esophageal). read more