Another reason to avoid DE
I have another comment to add to the advice offered for “Diatomaceous Earth As a Dewormer?” (Consultants, EQUUS 439). Aside from the fact that diatomaceous earth (DE) is not effective as a dewormer, there’s another, very important reason I wouldn’t suggest feeding it to a horse: sand colic.
I live in an area of Northern Michigan where sand colic is very common, and so the idea of purposely feeding my horses even more dirt is unfathomable. In fact, I knew someone whose colicking horse had an incredible amount of dirt in his fecal sample. Then I found out she fed DE to her horse every day for worms. The horse almost died of sand colic instead! Leigh Kuhn Kalkaska, Michigan