What diatomaceous earth is
Diatomaceous earth (DE) is a fine powder made from the fossilized remains of tiny aquatic organisms called diatoms. Under a microscope the particles are sharp and abrasive, and the powder absorbs moisture. DE has industrial uses, such as in filters, and a food-grade form is sold for pest control and as a supplement.
Why people use it
Some owners add food-grade DE to a dog’s food hoping to remove intestinal worms, because it is seen as natural and inexpensive. The idea is that the sharp particles damage parasites or dry them out. It is also sometimes used on carpets or bedding as a dry measure against fleas.
Does it work as a dewormer?
There is no strong scientific evidence that DE reliably clears worms from a dog’s digestive tract. Veterinary experts generally point out that its drying and abrasive action is understood mainly for dry contact with insects, and that this action is expected to be much reduced once the powder is wet inside the gut. Testimonials online are not the same as controlled studies, and a dog’s stool may improve or worms may seem to disappear for reasons unrelated to the powder.
Because worms can cause real harm, the main risk of relying on DE is that an infection stays untreated while you wait for it to work.
Safety concerns
- Dust and lungs: Fine DE dust can irritate the airways, eyes and nose in dogs and people when breathed in. Avoid creating clouds of powder, and keep your dog away while you handle it.
- Digestive upset: Adding any new powder to food may upset the stomach in some dogs. Constipation or a dry, irritated mouth and throat are possible.
- Unknown effects: Safe long-term amounts for dogs have not been established by solid research, and we do not give any dosing on this site. Dogs with breathing problems, sensitive stomachs or other health conditions are particularly worth discussing with your vet.
Food-grade versus other types
Only food-grade DE is ever suggested for use around animals. Pool-grade and filter-grade DE are treated differently and are not intended for consumption or contact with pets. Products labeled as food-grade should still be handled carefully, and “food-grade” does not mean it has been proven effective as a dewormer. If you have any doubt about what a product contains, do not use it.
Handling it
Touching DE with bare hands is usually not dangerous, but it can dry and irritate skin, so gloves are a sensible precaution. Avoid inhaling the dust, consider a mask when handling larger amounts, and keep the container closed and out of reach of children and pets. Wash your hands afterward. If dust gets in anyone’s eyes, rinse with water, and seek medical advice if irritation lasts.
Risks of relying on it
Worms are not just a nuisance. Roundworms, hookworms, whipworms and tapeworms can cause weight loss, diarrhea, anemia and poor growth, particularly in puppies, and some types can pass to people. Delaying proper treatment can let a problem get worse. Our guide to how to get rid of worms in dogs explains the signs to look for, and do dogs need worming covers routine control.
A safer path for treating worms
- Contact your vet if you think your dog has worms or you want to prevent them.
- Bring a fresh stool sample if asked, so the worm type can be identified.
- Use a medicine chosen for your dog’s age, weight and worm type, and follow the vet’s instructions exactly, including any repeat treatment.
- Keep up hygiene and flea control to reduce reinfection.
If you would still like to use a natural product as an extra, ask your vet whether it is appropriate and whether it could interfere with anything your dog is taking. Do not use it instead of treatment.
Fleas and the home
DE is sometimes used in the home for fleas, but how well it works is debated and it needs careful handling because of the dust. See our article on alternative flea treatments for safer, more practical household steps and for a wider look at natural options. For overall protection, see flea, tick and heartworm prevention.
When to see a vet
See your vet if your dog has diarrhea, vomiting, weight loss, a swollen belly, visible worms or rice-like segments, a cough, or any signs of illness. Seek urgent help if your dog is coughing, wheezing or struggling to breathe after exposure to powder, or if a puppy is weak, pale or off its food.