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Neem Oil
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Neem seed has a long history of use for insect control, especially in India. Azadirachtin, a compound in neem seed extracts and oils, effectively reduces flea counts. A study cited by Colorado State University found that topical application of a neem mist-spray on dogs and cats immediately reduces the number of fleas in 19 days. However, exposure to large doses of neem can impair a dog's thyroid function and cause hepatotoxicity. If orally ingested by infants and young children, it could also cause toxic encephalopathy.
Sassafras Oil
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Sassafras oil, which contains linalool, repels insects such as mosquitoes, fleas, mites, ticks and spiders. It often appears as an ingredient in dog flea sprays. According to Colorado State University, a study found it to be effective against Diamanus montanus, which is a ground squirrel flea. Oil of Ceylon and cinnamon also contain linalool and have similar uses.
Lavender Oil
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One of the most common essential oils used on animals, lavender essential oil can help repel fleas and ticks on dogs, according to Christina Chambreau, DVM. It can also help with ear problems. Lavender oil helps the skin regenerate and has a calming effect. It also has anti-itch and anti-bacterial properties. Some commercial shampoos beneficial for the skin and coat contain lavender as an ingredient.
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Pest Repellents Using Essential Oils for Dogs
Pest control products for dogs usually repel fleas and mites. Natural topical products for pest control often contain essential oils, which are plant-based compounds in high concentrations. Consult a veterinarian before using an essential oil on a dog because some essential oils can cause allergic reactions and even death. Pre-formulated products containing essential oils tend to be safer than pure essential oils.