A dry mixture of equal parts diatomaceous earth, neem and yarrow makes an effective and non-toxic flea and tick powder that also repels flies and mosquitoes, according to DogsNaturallyMagazine.com. A mixture of crushed, dried herbs, such as rosemary, eucalyptus, fennel and yellow dock is another flea deterrent.
Dust carpeting, couches, bedding and other surfaces with the mixture of diatomaceous earth, neem and yarrow. If pets are infested, apply a teaspoon or less to their coats and work it in briskly, front to back, on a monthly basis.
Diatomaceous earth is an all-natural mineral compound powder composed of microscopic skeletal remains of unicellular plants called diatoms. This lethal-to-insects dust is approximately 33 percent silicon, 19 percent calcium, 5 percent sodium, 3 percent magnesium, 2 percent iron and several other trace minerals. It kills insects by drying out their external protective covering and damaging their internal systems.
Neem contains an ingredient called oneliminoid that is 95 percent effective as a pesticide and insecticide. Yarrow is a flowering plant from the sunflower family that acts as a repellent.
White vinegar and citrus from fresh lemons are natural flea deterrents; use them as sprays or washes on flea-infested pets. Essential oils that repel fleas include cinnamon, clove, peppermint, cedar wood and pennyroyal.