---
title: "Essential Oils Safe for Cats & Dogs? Checker | Scent Lilt"
description: "Is an essential oil or diffuser safe around your cat or dog? Check the oil and how it's used against veterinary sources, with poison hotlines."
url: https://scentlilt.me/essential-oils-safe-for-cats-dogs/
---

# Are essential oils safe for cats and dogs?

**No essential oil has been shown to be safe for every pet, and cats are the most sensitive.** Veterinary sources agree that concentrated oils should never go on a pet's skin or fur, that a pet who licks or swallows oil needs advice straight away, and that a diffuser is safest run briefly, out of reach, in a room the pet can leave. Choose your pet, the oil and how you use it to see how careful to be, and why.

## If your pet has licked, swallowed or been splashed with oil

Do not make your pet vomit. Call your vet, an emergency vet, or an animal poison line, and have the bottle with you. Fees and numbers as of 3 November 2026:

- **United States** ASPCA Animal Poison Control Center, [(888) 426-4435](tel:+18884264435), 24 hours a day; a consultation fee may apply.
- **US, Canada, Caribbean** Pet Poison Helpline, [(855) 764-7661](tel:+18557647661), 24/7; $99 per incident, follow-up calls included.
- **United Kingdom** Animal PoisonLine (run by the Veterinary Poisons Information Service), [01202 509 000](tel:+441202509000), 24 hours; £35 per call 8am to 8pm Monday to Friday, £45 at other times.
- **Australia, New Zealand** Animal Poisons Helpline, [1300 869 738](tel:+611300869738) (Australia) or [0800 869 738](tel:+64800869738) (New Zealand), 24/7.
- **Anywhere else** Your own vet or the nearest emergency vet.

## Why cats are more at risk

Cats are poor at one of the main ways the body clears chemicals. A 2000 study found that the cat's gene for the liver enzyme UGT1A6 does not work (it is a pseudogene), which helps explain why cats have a much lower capacity than most mammals to process phenolic compounds by glucuronidation. The Merck Veterinary Manual links this enzyme deficiency to essential oils directly: it makes cats very sensitive to the phenols some oils contain. Grooming adds to the risk, because oil that settles on fur ends up in the mouth. Pet Poison Helpline adds that cats with asthma or other airway problems are more likely to react badly to oils in the air.

None of this means a dog is safe: the oils named for dogs below poison dogs too, and a published series of 443 tea tree oil cases included 337 dogs.

## Which oils the veterinary sources name

Pet Poison Helpline, a 24-hour animal poison control service, lists the essential oils known to poison each species. A dash means that list does not name the oil for that species, which is not the same as safe.

| Oil | Cats | Dogs | Also noted by the Merck Veterinary Manual |
| --- | --- | --- | --- |
| Tea tree (melaleuca) | Named | Named | The oil most often reported in pet poisonings; can harm the liver |
| Pennyroyal | Named | Named | Deaths documented in small animals; liver; seizures |
| Wintergreen | Named | Named | High in methyl salicylate: aspirin poisoning; seizures |
| Sweet birch | Named | Named | High in methyl salicylate: aspirin poisoning; seizures |
| Cinnamon | Named | Named | Cinnamon oil and cassia bark can harm the liver |
| Eucalyptus | Named | Named | Can cause seizures |
| Pine | Named | Named | – |
| Clove | Named | – | – |
| Peppermint | Named | – | – |
| Citrus (d-limonene) | Named | – | – |
| Ylang ylang | Named | – | – |
| Lavender | – | – | Much remains unknown about safe dosing |

The Merck Veterinary Manual also lists birch tar, cedar, hyssop, sage and wormwood among oils that can cause seizures, without splitting them by species.

## How you use it matters

Passive diffusers give off scent; active diffusers put droplets of oil in the air, and on your pet (Merck Veterinary Manual).

- **Reed diffusers and candles** do not give off droplets of oil, so unless one is knocked over, the main hazard is irritation of the airways.
- **Ultrasonic and nebulising diffusers** put microdroplets into the air. They settle on fur, where the oil is absorbed through the skin or swallowed during grooming.
- **On the skin or fur**, the higher the concentration, the greater the risk, and concentrated oils should never be applied to pets. In the 443 cases of pets given 100% tea tree oil, mostly on purpose and on the skin, signs began within 2 to 12 hours and lasted up to three days. Plant-oil flea products caused reactions in a study of 48 dogs and cats, most of which had been treated as the label said.
- **Swallowed** oil can cause stomach upset, depression of the nervous system and even liver damage in cats, according to the ASPCA Animal Poison Control Center. Liquid potpourri and some diffuser liquids may also contain cationic detergents, which can cause chemical burns to the mouth and throat; the ASPCA says cats appear especially sensitive.

## Signs of essential oil poisoning

Pet Poison Helpline lists drooling, vomiting, tremors, wobbliness (ataxia), breathing difficulty, a low heart rate, a low body temperature and, in cats, liver failure. The Merck Veterinary Manual adds lethargy and loss of appetite, and for oils breathed in: watery eyes and nose, coughing, wheezing and fast or laboured breathing. Signs can appear within minutes or take hours. A coughing cat can look as if it is bringing up a hairball, so mention any coughing to your vet.

## What to do

1. Move your pet away from the source and into fresh air.
2. Do not make it vomit: oil can be breathed into the lungs.
3. If oil is on the fur or skin, wash it off with liquid dish soap and water, and stop your pet licking it until then.
4. Keep the bottle, so you can say which oil and what concentration.
5. Call your vet or one of the poison lines above, even if your pet seems fine.

## Safer habits with scent at home

The Merck Veterinary Manual's advice is short: don't apply concentrated oils to pets, avoid oils known to be toxic, prevent swallowing, keep pets out of the room while a diffuser runs and ventilate afterwards, run diffusers for under 30 minutes, and use diluted rather than concentrated oils. The ASPCA adds that a diffuser used briefly in a secured area your pet cannot reach is not likely to be a problem, but that if your pet has a history of breathing problems it may be best not to use one at all.

Winter is peak season for scent. Around Thanksgiving (Thursday 26 November 2026) and Christmas, many home blends lean on cinnamon, clove, pine, peppermint and eucalyptus, all on Pet Poison Helpline's list for cats. Choose a reed diffuser or a candle placed out of reach, or skip the oils in rooms your cat uses. Pet shampoos are a different case: Pet Poison Helpline says products with less than 1 to 2% tea tree oil are generally considered non-toxic when used as directed.

This page is general information, not veterinary advice. Your vet knows your pet's health and should have the final word.

## Questions

**Is lavender oil safe for cats?**

None of the veterinary sources we checked names lavender oil as poisonous, but none calls it safe either; the Merck Veterinary Manual notes that much remains unknown about safe dosing. Treat it like any concentrated oil: never on the cat, and only briefly in the air, out of reach.

**Is a diffuser safe for dogs?**

The ASPCA says a diffuser used for a short time in a secured area the dog cannot reach is not likely to be an issue, but advises against one for a dog with breathing problems. Avoid oils named as poisonous to dogs, such as tea tree, pennyroyal, wintergreen and eucalyptus.

**Can I use a reed diffuser with a cat in the house?**

A reed diffuser gives off scent but no droplets, so it is lower risk than an ultrasonic one. Keep it where the cat cannot knock it over or drink from it, in a room the cat can leave, and don't use one around a cat with asthma.

**What should I do if my cat licked essential oil?**

Call your vet or an animal poison line straight away, even if your cat seems fine. Don't make it vomit, wash any oil off its fur with liquid dish soap, and keep the bottle for the vet.

**Are pet shampoos with tea tree oil safe?**

Pet Poison Helpline says pet products such as shampoos with less than 1 to 2% tea tree oil are generally considered non-toxic when used as the label directs. The danger is concentrated oil, where a few drops can cause serious signs.

## Sources

1. Benson K. Toxicoses From Essential Oils in Animals. Merck Veterinary Manual, full review March 2025. [merckvetmanual.com](https://www.merckvetmanual.com/toxicology/toxicoses-from-household-hazards/toxicoses-from-essential-oils-in-animals).
2. Herbal Medicine in Veterinary Patients. Merck Veterinary Manual, last updated October 2025. [merckvetmanual.com](https://www.merckvetmanual.com/therapeutics/integrative-complementary-and-alternative-veterinary-medicine/herbal-medicine-in-veterinary-patients).
3. Pet Poison Helpline: Essential Oils and Cats; Essential Oils and Dogs; Updates on Essential Oils; Tea Tree Oil; FAQ (fees). [Cats](https://www.petpoisonhelpline.com/uncategorized/essential-oils-cats/), [Dogs](https://www.petpoisonhelpline.com/uncategorized/essential-oils-dogs/), [Updates](https://www.petpoisonhelpline.com/uncategorized/updates-on-essential-oils/), [Tea tree oil](https://www.petpoisonhelpline.com/poison/tea-tree-oil/), [FAQ](https://www.petpoisonhelpline.com/faq/).
4. ASPCA Animal Poison Control Center: The Essentials of Essential Oils Around Pets (23 June 2022); Pet Poisons: Be Mindful of These Household Products (4 June 2020); What Pet Parents Need to Know About Corrosive Household Products (17 September 2026); decontaminating your pet (8 August 2018); ASPCA Poison Control. [2022](https://www.aspca.org/news/essentials-essential-oils-around-pets), [2020](https://www.aspca.org/news/pet-poisons-be-mindful-these-household-products-and-cleaning-agents), [2026](https://www.aspca.org/news/what-pet-parents-need-know-about-corrosive-household-products), [2018](https://www.aspca.org/news/my-pet-walked-through-paint-now-what-how-decontaminate-your-pet), [Poison Control](https://www.aspca.org/pet-care/aspca-poison-control).
5. Court MH, Greenblatt DJ. Molecular genetic basis for deficient acetaminophen glucuronidation by cats: UGT1A6 is a pseudogene, and evidence for reduced diversity of expressed hepatic UGT1A isoforms. Pharmacogenetics 2000;10(4):355-369. doi:10.1097/00008571-200006000-00009. [PubMed](https://pubmed.ncbi.nlm.nih.gov/10862526/).
6. Khan SA, McLean MK, Slater MR. Concentrated tea tree oil toxicosis in dogs and cats: 443 cases (2002-2012). J Am Vet Med Assoc 2014;244(1):95-99. doi:10.2460/javma.244.1.95. [PubMed](https://pubmed.ncbi.nlm.nih.gov/24344857/).
7. Genovese AG, McLean MK, Khan SA. Adverse reactions from essential oil-containing natural flea products exempted from Environmental Protection Agency regulations in dogs and cats. J Vet Emerg Crit Care 2012;22(4):470-475. doi:10.1111/j.1476-4431.2012.00780.x. [PubMed](https://pubmed.ncbi.nlm.nih.gov/22805458/).
8. Animal PoisonLine, Veterinary Poisons Information Service (UK). [animalpoisonline.co.uk](https://www.animalpoisonline.co.uk/).
9. Animal Poisons Helpline (Australia and New Zealand). [animalpoisons.com.au](https://www.animalpoisons.com.au/about-us/).