Nontoxic flea control products include black walnut, flea treats and fine-toothed flea combs. Diatomaceous earth and products that contain beneficial nematodes, such as Interrupt, are also safe for humans, pets and other animals, according to People for the Ethical Treatment of Animals.
Black walnut, which is available in drug stores in liquid or capsule form, typically repels fleas in dogs. Pet owners should administer the minimum effective dose, since higher doses can be toxic, warns People for the Ethical Treatment of Animals. Flea treats are flea-repelling supplements that contain vitamin B. Pet owners who wish to avoid chemical products can use fine-toothed combs to catch and freeze fleas. The combs are effective when used with a bowl of soapy water on a daily basis.
Diatomaceous earth also eliminates fleas safely when sprinkled on carpets. The powder, which consists of fossilized algae remains, should be allowed to sit on the carpet for several hours before vacuuming. Pet owners can also use gentle herbal shampoos to clean their pets. Alternatively, pet owners can spray products with beneficial nematodes on lawns to repel and eliminate fleas. These products are available in many home improvement, garden and animal supply stores, claims People for the Ethical Treatment of Animals.