By Dial A Vet Veterinary Team
Tea tree oil is an Australian staple, and it is easy to assume something natural and familiar must be a gentle flea remedy. It is not. Tea tree oil (melaleuca oil) is absorbed through the skin and can poison cats and dogs, causing wobbliness, tremors, weakness and a dangerous drop in body temperature. Cats are especially vulnerable, and small dogs are at higher risk too. It also does not reliably control fleas. Our clear advice is not to use it on your pets at all, and to choose a registered flea product instead.
Key takeaways
- Tea tree oil is toxic to cats and dogs, including when applied to the skin.
- Cats are particularly sensitive because they cannot break down some of its compounds well.
- Diluted or "pet" tea tree products are not proven safe and are not reliable flea control.
- Signs of poisoning can start within hours and include drooling, wobbliness, tremors and weakness.
- If your pet has been exposed, call a vet straight away. Do not wait for signs.
Why tea tree oil is dangerous for pets
Tea tree oil contains compounds called terpenes. They are absorbed quickly through the skin and from the gut when pets lick their coat. Cats lack some of the liver pathways needed to process these compounds, so even small amounts can build up. Poisoning has been reported after undiluted oil was applied directly to pets and after use of diluted home mixtures and products sold for animals. Diffusing oils in small, closed rooms is also not recommended around cats.
Does it work against fleas?
There is no good evidence that tea tree oil kills fleas reliably or prevents reinfestation. Even if a few adult fleas are repelled, it does nothing about the eggs, larvae and pupae in your home, which make up most of a flea population. Relying on it delays effective treatment while exposing your pet to risk.
Signs of tea tree oil poisoning
- Drooling or foaming at the mouth
- Vomiting
- Wobbliness, stumbling or difficulty walking
- Weakness, especially in the back legs
- Muscle tremors or twitching
- Low body temperature and cold ears or paws
- Depression, lethargy or hiding
- Red or irritated skin where the oil was applied
- Collapse, seizures or coma in severe cases
Signs usually appear within two to twelve hours of exposure and can last several days.
When to see a vet
Emergency now: any cat exposed to tea tree oil, any pet that has swallowed it, or any pet showing tremors, wobbliness, weakness, collapse or seizures after exposure. Phone ahead to your vet or nearest emergency clinic.
Same day: a dog with a small skin exposure that seems well. Call a vet for advice, as signs may develop later.
What to do if your pet has been exposed
- Call your vet or emergency clinic immediately and tell them the product name, how much was used, how it was applied and when.
- Bring the bottle or packaging with you.
- Your vet may advise washing the oil off with lukewarm water and a mild dishwashing liquid before you travel. Wear gloves, and keep your pet warm and dry afterwards.
- Stop your pet from licking the area.
- Do not make your pet vomit. This can cause further harm.
- Do not give milk, oils, charcoal or any human medicine unless your vet tells you to.
How vets treat tea tree oil poisoning
Treatment is supportive and aims to remove the oil and protect the body while it is cleared. This may include bathing, warming, intravenous fluids, medicines to control tremors or seizures, and monitoring of liver function. Most pets treated early recover, but severe cases can need several days of hospital care.
Safer flea control
- Use a flea product registered for your pet's species, age and weight, and follow the label.
- Never use dog flea products on cats. Some contain permethrin, which is deadly to cats.
- Treat every pet in the household at the same time.
- Vacuum often and wash bedding in hot water to clear eggs and larvae.
- Ask your vet to help choose a product if your pet has sensitive skin or other health conditions.
Our guides to cat flea treatment and prevention and essential oils and cats have more detail.
Other essential oils to keep away from pets
Tea tree oil is not the only concern. Eucalyptus, pennyroyal, peppermint, citrus, wintergreen, cinnamon, pine and ylang ylang oils can all cause problems, especially for cats. Store oils securely and avoid applying any essential oil to your pet unless your vet has specifically advised it.
FAQ
Is a few drops in a shampoo safe?
Dilution lowers the risk but does not remove it, and there is no flea benefit worth the risk. Choose a pet-safe shampoo without essential oils.
My dog licked a little tea tree cream off my skin. Is that a problem?
Small amounts in creams are usually low concentration, but call your vet for advice based on the product and your dog's size.
Can tea tree oil be used on pet wounds?
No. It can irritate damaged skin and pets will lick it off. Use the wound care your vet recommends.
Talk with a vet
If you have used tea tree oil on your pet and are worried, a Dial A Vet consult can help you work out how urgent it is. A cat that has been exposed, or any pet with tremors, wobbliness or collapse, needs an in-person emergency vet now.
References
- ASPCA Animal Poison Control: Essential oils and pets
- Khan SA, McLean MK, Slater MR. Concentrated tea tree oil toxicosis in dogs and cats: 443 cases (2002 to 2012). Journal of the American Veterinary Medical Association, 2014
- International Cat Care: Essential oils and cats
Disclaimer: Educational only. This page does not replace an examination or advice from your own veterinarian. If your pet has been exposed to a toxin, contact a vet immediately.
