Daily recommended food grade diatomaceous earth feeding rates:
Kittens - 1/2 teaspoon
Cats - 1 teaspoon
Puppies - 1/2 to 1 tsp.
Dogs under 35 lbs. - 1 teaspoon
Dogs over 35 lbs. - 1 tablespoon
Dogs over 100 lbs. - 2 tablespoons
Cattle, Dairy Cows, & Hogs - 2% of dry feed ration
Chickens - 5% in feed
Goats, Sheep, Alpacas, & Llamas - 2% in grain
Horses - 1/2 to 1 cup in daily ration
Zoo animals - 2% in daily feed
Internal feeding of food grade diatomaceous earth helps eliminate most internal worms, including roundworms, pin worms, tapeworms, etc. It's also excellent when fed daily to keep down fly loads, since food grade diatomaceous earth is eliminated from the body, exactly the way it went in, it helps reduce the manure odor and kills flies that come in contact with it.
Mix in animal feed or grain and/or feed free choice. Our goats, fowl, and dogs eat it free choice.
If fecal counts are not zero for worms and ova after feeding DE for 30 days, increase the daily dose. Feeding too small a dose of DE will not give desired results. Increasing the dose, even if greater than the above recommendations, will not harm anyone. Some horses do fine on 1/2 cup of DE daily, others need a full cup. This reminds us, that all beings are different. So again, if the worm and ova counts are not zero, increase your daily dose.
Remember, the diatomaceous earth MUST come in contact with the worms in order to "dehydrate" them and since worms can kill us or our pets and at the very least, cause disease, more is better to prevent having to deal with disease or death.