Essential oils and dogs: lavender, tick repellents and using a diffuser at home

If you enjoy essential oils and share your home with a dog, you have probably wondered whether your usual aromatherapy routine is suitable for both of you. Perhaps you have also seen lavender recommended for nervous dogs, or geranium suggested as a natural tick repellent.

There is research behind some of these ideas. The important questions are which preparation was studied, how it was used and what the findings mean for everyday life with your dog.

A pleasant aroma for us can be overwhelming for an animal. And an essential oil that repels ticks in a laboratory is not automatically a suitable treatment for a dog’s coat.

Why use essential oils around dogs?

Dogs do not need a fragranced grooming routine. However, researchers have explored particular uses of aromatic plants, including scent exposure for unsettled behaviour and botanical ingredients for parasite control.

These are separate applications. Gently scenting an environment, applying a formulated product to the coat and giving something orally involve different exposures. Advice for one cannot simply be transferred to another.

For most owners, the first practical question is how to enjoy essential oils at home while respecting the dog’s comfort.

What does the research say about lavender?

Lavender (Lavandula angustifolia) is one of the better-known oils in research on canine behaviour.

A study involving 32 dogs with a history of excitement during car journeys examined their behaviour with and without exposure to lavender odour. During lavender exposure, the dogs spent more time resting and sitting, and less time moving and vocalising.[1]

This is an interesting finding about a specific situation. It does not establish a universal treatment for anxiety or a recipe for applying lavender to the skin.

Persistent distress, separation anxiety or a sudden change in behaviour deserves attention to its cause. Scent can only be one part of that wider picture.

Can essential oils repel ticks?

Some essential oils and their constituents have demonstrated tick-repellent activity. Lavender, geranium and preparations derived from lemon eucalyptus have all been investigated against the European tick Ixodes ricinus.[2]

Their performance depends on the formulation, concentration, tick species and time since application. Results from treated cloth or laboratory tests tell us about repellency, but do not establish a safe dose for a dog.

There is also research involving dogs directly. In a 2018 study, dogs treated before walks with a formulated turmeric-oil spray had fewer ticks attached to the treated legs and belly than untreated dogs or those receiving an orange-oil preparation.[3]

The study used 2.5% turmeric oil with a specified dispersing ingredient. That is a description of the experimental preparation, rather than a home-use recommendation.

These findings make botanical repellents a worthwhile area of research. They do not demonstrate that a homemade lavender or geranium mixture provides reliable protection throughout a woodland walk.

Continue your dog’s established veterinary parasite-prevention programme and check the coat after walks. Pay particular attention around the ears, neck, armpits, belly and between the toes.

Lemon eucalyptus and PMD are different preparations

The names can be confusing. Lemon eucalyptus essential oil (Corymbia citriodora) and PMD-rich repellent ingredients are not interchangeable.

PMD stands for para-menthane-3,8-diol. Certain commercial repellents use processed ingredients with a much higher PMD content than ordinary lemon eucalyptus essential oil.

Consequently, evidence for a PMD-based repellent cannot be used to promise the same protection from a few drops of essential oil in a homemade spray. Nor should a repellent intended for people be assumed suitable for dogs.[4]

Using a diffuser in a home with a dog

If you use essential oils for yourself, plan the room around your dog’s freedom to avoid the aroma.

Keep the door open, ventilate the room and provide access to another room where no oils are being diffused. Your dog must be able to leave at any time.

Never run a diffuser beside a crate, in an enclosed kennel or in a room where the dog is confined. Keep the device and bottles out of reach, and avoid continuous diffusion.

The type of diffuser matters. Ultrasonic diffusers and nebulisers release small oil droplets into the air. These can settle on the coat and subsequently be swallowed during grooming. An open door gives the dog a choice, but does not remove every exposure risk.[5]

For dogs with respiratory disease, discuss household diffusion with their vet before using it.

Watch the animal rather than assuming that remaining in the room means enjoyment. If your dog turns away, leaves, sneezes or appears uncomfortable, stop the diffuser and air the room. Do not bring the dog back to “get used to” the smell.

Why there is no single safe dilution for every dog

A percentage describes the strength of a mixture. It does not tell us how much of that mixture reaches the animal.

A small application to one area and repeated spraying across the whole coat can deliver very different amounts, even at the same concentration. The oil’s composition, application frequency, licking, age and health also matter.

For this reason, a dilution chart based only on body weight is insufficient for choosing a treatment.

For skin or coat application, use a product specifically formulated for dogs, following its instructions and veterinary guidance. Keep concentrated essential oils away from the nose, eyes, mouth and ears, and do not add them to food or drinking water.

Why oil and water do not make a suitable spray

Essential oils do not dissolve in water. Adding drops to a spray bottle and shaking it does not produce a reliably diluted mixture. The same applies when hydrosol is used instead of water.

A properly formulated spray needs suitable dispersion, stability and preservation, as well as an assessment of the ingredients for its intended animal use.

Similarly, adding essential oils to an existing dog shampoo changes its formulation. A ready-made canine product is a more dependable choice than improvising with a human aromatherapy recipe.

What about peppermint and tea tree?

Peppermint (Mentha piperita) should not appear in a general list of oils that owners can freely use on dogs. Veterinary toxicology guidance identifies peppermint among oils capable of causing poisoning through inappropriate exposure.[6]

Tea tree (Melaleuca alternifolia), pennyroyal (Mentha pulegium), wintergreen (Gaultheria procumbens) and sweet birch (Betula lenta) also warrant particular caution. Concentrated oils can cause serious harm.[5,6]

Calling another oil “gentle” does not make every method of using it suitable. A dog’s interest in an aroma is useful behavioural information, but it is not a test of medical safety.

Recognising an adverse reaction

Stop exposure if your dog develops coughing, eye irritation or obvious discomfort. Move the dog to fresh air and prevent access to the product.

Drooling, vomiting, unusual weakness, unsteady movement, tremors or breathing difficulties require prompt veterinary advice. If oil has been swallowed or spilled onto the coat, contact your vet immediately and keep the bottle or ingredient list available. Do not induce vomiting.[5,6]

A thoughtful approach to aromatherapy at home

The most useful starting point is a clear purpose. Are you enjoying an aroma yourself, exploring support for unsettled behaviour or looking for protection during walks? Each question needs its own answer.

Research into lavender and botanical repellents offers interesting possibilities. At home, the priorities are practical: give your dog an unscented place to retreat, keep the door open during diffusion, avoid improvised coat treatments and use dependable parasite protection for outdoor adventures.

References

1. Wells, D. L. (2006). “Aromatherapy for travel-induced excitement in dogs.” Journal of the American Veterinary Medical Association, 229(6), 964–967. Read the study.

2. Jaenson, T. G. T., Garboui, S. and Pålsson, K. (2006). “Repellency of oils of lemon eucalyptus, geranium, and lavender and the mosquito repellent MyggA Natural to Ixodes ricinus in the laboratory and field.” Journal of Medical Entomology, 43(4), 731–736. Read the study.

3. Goode, P., Ellse, L. and Wall, R. (2018). “Preventing tick attachment to dogs using essential oils.” Ticks and Tick-borne Diseases, 9(4), 921–926. Read the study.

4. Centers for Disease Control and Prevention. “Mosquitoes, ticks, and other arthropods.” CDC Yellow Book. Read the guidance.

5. Merck Veterinary Manual. “Toxicoses from essential oils in animals.” Read the veterinary guidance.

6. VCA Animal Hospitals. “Essential oil and liquid potpourri poisoning in dogs.” Read the veterinary guidance.