So far, I haven't been able to find any actual, published, scientific research on Diatomaceous Earth (DE) as an intestinal wormer for dogs, but I did find such research that was conducted on free-range poultry. The research was conducted by D. C. Bennett*, Y.-J. Rhee, A. Yee, and K.M. Cheng, University of British Columbia, Vancouver, BC, Canada. The abstract is presented on page 81 of the 98th Annual Meeting of the Poultry Science Association, July 2009. You may download the actual science via the link here:

Essentially, the findings are exactly as I suspected, the product had ZERO effect on intestinal worms. However, the good news for DE users was the product did seem to improve growth rate and body mass in the hens and growing chickens, and it also produced thicker egg shells and bigger yolks, so the compound may well be a worthy addition to the diet ... for NUTRITIONAL reasons, not as a wormer. Here is a copy of the relevant page:

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If anyone has some actual, published, scientific research (from an accredited source) on the affect of DE on dogs, I would like to see it, but until then it is my opinion that this credible account on chickens in all probability holds true for dogs too. I would like to thank the people who made their claims about this product loud enough to inspire me to prove them wrong with actual science, as regards to worms, and yet to allow me to validate their claims as to DE's residual health benefits in other ways. This is why I placed this finding in the Nutrition Section, not the Disease Section, as DE is now officially considered a "health supplement" on this forum, and not an internal wormer.

Jack