Essential Oils Toxic to Cats and Dogs: Which Oils, Warning Signs and Safe Use at Home
If you love essential oils and share your home with a cat or dog, you have probably wondered which oils are dangerous. This guide lists the essential oils toxic to cats and dogs, explains why cats are especially sensitive, and shows the warning signs of poisoning. It also covers what to do in an emergency and how to use a diffuser more safely.
This article is for information only and is not veterinary advice. Talk to your veterinarian before using any essential oil on or around a pet. Take extra care with cats, birds, very young or old animals, and pets with health conditions.
Pet exposed to an essential oil? Act now.
- Move your pet to fresh air and away from the oil.
- Do not make your pet vomit. Oils can be inhaled into the lungs.
- Call your veterinarian, an emergency vet, or a pet poison line straight away.
ASPCA Animal Poison Control: (888) 426-4435, open 24/7.
Pet Poison Helpline: (855) 764-7661, open 24/7.
Both services may charge a consultation fee. Keep the oil bottle handy when you call.
Why essential oils can harm cats and dogs
An essential oil is a highly concentrated extract of a plant’s aromatic compounds. A single bottle can hold the scent chemicals of a large amount of plant material. That concentration is what makes oils useful in perfume and cleaning, and it is also what makes them risky for small animals.
The MSD Veterinary Manual names tea tree oil as the most commonly reported essential oil poisoning in pets. It also notes that owners often cause exposures with good intentions. They may use “natural” flea sprays, home remedies or cleaning products without knowing the risk.
Three ways oils reach a pet
1. Skin
Oils pass through skin into the bloodstream. Applying oil to fur, paws or bedding counts as skin exposure.
2. Mouth
Licking a spill, chewing a bottle or grooming oily fur all count. Cats groom constantly, so skin exposure quickly becomes oral too.
3. Air
Breathing strong vapors can irritate the airways. Fine droplets from some diffusers also settle on fur.
Why cats are more sensitive than dogs
The difference is in the liver. Cats lack key forms of an enzyme family called glucuronyl transferase. People and dogs use these enzymes to break down many plant chemicals. Robert Tisserand of the Tisserand Institute names several missing forms, including UGT1A6.
Without them, some compounds clear slowly and can build up. The MSD Veterinary Manual says this makes cats very sensitive to phenols, a group of compounds found in some oils. Grooming adds to the problem, because cats lick off anything that lands on their coat.
Dogs do not share this enzyme gap, but they are still at risk. Puppies, older dogs, pregnant dogs and small breeds are more vulnerable, according to veterinarians at Oklahoma State University. A small dog simply receives a larger dose per kilogram of body weight.
Birds and pets with breathing problems
Birds are the most sensitive of all. Their airways react strongly to fragrances and aerosols, and the MSD Veterinary Manual places them at particular risk. Ontario SPCA advises avoiding diffusers entirely in homes with birds. Pets with asthma, allergies or chronic bronchitis are also at greater risk from inhaled oils.
Essential oils toxic to cats and dogs: the main list
No single list is complete. The ASPCA, quoted by Ontario SPCA, says there is no clear answer on exactly which oils harm which animals. Research is still limited. The table below gathers oils that veterinary sources repeatedly flag, with the reason each one causes concern.
| Oil | Main concern | Cats | Dogs | Flagged by |
|---|---|---|---|---|
| Tea tree (melaleuca) | Nervous system effects, liver damage | High risk | High risk | MSD, Pet Poison Helpline, Tisserand |
| Pennyroyal | Liver failure, seizures | High risk | High risk | MSD, Pet Poison Helpline, Tisserand |
| Wintergreen | Methyl salicylate, an aspirin-like compound | High risk | High risk | MSD, Pet Poison Helpline |
| Sweet birch, birch tar | Methyl salicylate; liver concerns | High risk | High risk | MSD, Pet Poison Helpline |
| Cinnamon, cassia bark | Liver concerns, irritation | Risk | Risk | MSD, Pet Poison Helpline |
| Clove | Phenol content (eugenol) | Risk | Use caution | Pet Poison Helpline |
| Eucalyptus | Linked to seizures | Risk | Risk | MSD, Pet Poison Helpline |
| Pine | Stomach and skin irritation, liver and kidney effects | Risk | Risk | Pet Poison Helpline |
| Peppermint | Menthol, more toxic to cats | Risk | Use caution | Pet Poison Helpline, Tisserand |
| Citrus oils | d-Limonene | Risk | Use caution | Pet Poison Helpline |
| Ylang ylang | Listed as harmful to both species | Risk | Risk | Pet Poison Helpline |
| Wormwood, hyssop, sage, cedar | Linked to seizures | Risk | Risk | MSD |
| Nutmeg | Cats are quite susceptible | Risk | Use caution | Tisserand |
“High risk” marks oils with serious documented harm. “Risk” means veterinary sources warn against exposure. “Use caution” means sources flag the oil mainly for cats. An oil missing from this table is not proof it is safe.
Tea tree oil: the most common case
Tea tree oil deserves special attention because people often reach for it to treat a pet’s skin. A 2014 report in the Journal of the American Veterinary Medical Association reviewed ASPCA Animal Poison Control data from 2002 to 2012. It covered 443 dogs and cats exposed to 100% tea tree oil.
About 77% of those animals showed signs of poisoning. Signs typically began within 2 to 12 hours and could last up to three days. The most common were drooling, weakness, lethargy, poor coordination and muscle tremors. Young cats and small adult cats were more likely to have severe signs.
Pet Poison Helpline points out an important detail. The main problem is concentrated oil, not the low levels found in some veterinary shampoos. Our tea tree oil guide covers its uses and safe dilution for people.
Pennyroyal: never as a flea treatment
Pennyroyal has a long folk reputation as a flea repellent. Tisserand calls it perhaps the greatest aromatherapy-related threat to cats. Pet Poison Helpline links it to vomiting, bloody diarrhea and death from liver failure in dogs. Use a flea product your veterinarian recommends instead.
Wintergreen and sweet birch: hidden aspirin
Both oils are rich in methyl salicylate, a chemical relative of aspirin. The MSD Veterinary Manual warns they can cause aspirin poisoning. Pet Poison Helpline lists stomach ulcers and possible kidney and liver failure. Cats handle aspirin-like compounds especially poorly, so keep these oils well out of reach.
Clove and other phenol-rich oils
Phenols are the compounds cats struggle most to clear, as the MSD Veterinary Manual explains. Clove oil is rich in eugenol, a phenol, which is why Pet Poison Helpline lists clove among oils dangerous to cats. Warm, spicy oils such as clove and cinnamon are also common in holiday diffuser blends and potpourri. If a blend smells of baking spice, keep it well away from your cat. Our clove bud oil guide covers its uses and safety for people.
Where essential oils hide in everyday products
Many pet exposures do not come from a bottle labeled “essential oil” at all. Oils are added to dozens of household products for scent. Check labels for the oil names in the table above, as well as general terms such as “fragrance oil” or “natural scent”.
| Product | Oils it often contains | How pets are exposed |
|---|---|---|
| “Natural” floor and surface cleaners | Pine, citrus, tea tree, eucalyptus | Walking on wet floors, then licking paws |
| DIY or “natural” flea sprays | Pennyroyal, tea tree, peppermint, citrus | Sprayed straight onto fur and skin |
| Liquid potpourri and simmer pots | Cinnamon, clove, citrus | Drinking or spilling hot liquid; burns to mouth and skin |
| Muscle rubs and chest balms | Wintergreen, peppermint, eucalyptus, camphor | Licking your skin, or chewing the tube |
| Room sprays and plug-in fresheners | Various blends | Inhaling, and droplets settling on fur |
| Skin oils and roll-ons you wear | Lavender, citrus, tea tree, peppermint | Cuddling, or a cat licking your hands |
Muscle rubs deserve a special mention. Products containing wintergreen hold methyl salicylate, the same aspirin-like compound behind wintergreen oil’s risk. Dogs are often drawn to the smell, so keep tubes in a drawer rather than on a nightstand.
Is any essential oil safe for cats and dogs?
This is the question most pet owners really want answered, and the honest answer is: it depends on the dose. Robert Tisserand argues that total exposure matters more than labeling oils “safe” or “toxic”. A whiff of a lightly diffused oil in a large, airy room is very different from oil rubbed into fur.
That is also why “pet-safe oil” lists online can mislead. No essential oil is safe to apply undiluted to a pet or to give by mouth. Veterinarians at Oklahoma State University say diluted products made for pets are generally safe when used as labeled. Homemade blends are a different matter, because the concentration is unknown.
| Lower risk | Higher risk |
|---|---|
| Brief diffusing in a large, ventilated room | Hours of diffusing in a small, closed room |
| The pet can leave the room freely | The pet is shut in a crate or small room with the diffuser |
| A passive diffuser placed out of reach | An ultrasonic or nebulizing diffuser near a cat |
| Veterinary products used as labeled | Homemade flea sprays or “natural” remedies |
| A healthy adult dog | A cat, bird, puppy, kitten, or pet with breathing problems |
| Bottles capped and stored in a closed cabinet | Open bottles, spills, or liquid potpourri within reach |
Lavender is a common example of this gray zone. It is popular and often described as gentle. Even so, the ASPCA lists the lavender plant as toxic to cats and dogs, and the oil is far more concentrated than the plant. Read our lavender oil guide for its uses and safety notes.
Are diffusers safe around pets?
Diffusers are the most common way pets meet essential oils. The type of diffuser matters, because each one exposes a pet differently.
Passive diffusers
Reed diffusers, scented candles and plug-in warmers. The MSD Veterinary Manual says these mainly cause airway irritation. The bigger danger is a pet knocking one over and getting oil on its fur or tongue.
Active diffusers
Ultrasonic and nebulizing models. These release tiny droplets that settle on fur and feathers. Pets then absorb them through the skin or swallow them while grooming. Pet Poison Helpline says they pose an even greater risk to cats.
Safer diffuser rules
- Keep sessions short. The MSD Veterinary Manual advises running diffusers for under 30 minutes at a time.
- Give pets an exit. Tisserand stresses that a cat must always be able to leave the room. Never diffuse in a closed room with a pet inside.
- Ventilate. Open a window or door, and air the room after diffusing.
- Keep it out of reach. Place the diffuser where tails, paws and noses cannot tip it over.
- Avoid feeding areas. Oklahoma State University vets warn that vapor can settle on pet food and water.
- Skip it entirely if you keep birds, or if your pet has asthma or another breathing problem.
- Watch your pet. Watery eyes, a runny nose, coughing or drooling are signs to switch the diffuser off and ventilate.
Pet Poison Helpline puts it plainly: none of these signs are normal in cats. If your cat sneezes, squints or breathes with its mouth open around a diffuser, stop using it.
Signs of essential oil poisoning in cats and dogs
The MSD Veterinary Manual says signs can appear within minutes to hours of exposure. With tea tree oil, the JAVMA report found signs usually started within 2 to 12 hours. Signs depend on the oil, its strength and how the pet was exposed.
| Body system | Signs to watch for |
|---|---|
| Breathing | Watery eyes or nose, coughing, wheezing, fast breathing, open-mouth breathing in cats |
| Mouth and stomach | Drooling, pawing at the mouth, vomiting, refusing food |
| Nervous system | Lethargy, wobbly walking, tremors, weakness in the back legs, seizures |
| Skin | Redness, burns or irritation where oil touched, an oily coat that smells of the oil |
| Whole body | Low body temperature, slow heart rate, collapse |
| Liver and kidneys | May not show for days; only blood tests can detect early damage |
Based on the MSD Veterinary Manual, Pet Poison Helpline and the 2014 JAVMA tea tree oil report.
A smell of oil on your pet’s breath, fur or vomit is a useful clue. Tell your veterinarian about it. The MSD Veterinary Manual notes that diagnosis relies mostly on the owner’s history.
What to do if your pet is exposed
Speed matters, but so does avoiding well-meant mistakes. Follow these steps in order.
Treatment is supportive, according to the MSD Veterinary Manual. It may include fluids, liver-protecting medicines, seizure control or oxygen. In the JAVMA tea tree review, signs could last up to three days, so follow-up checks matter.
Pet-safe habits for essential oil lovers
You do not have to give up essential oils to keep a pet safe. Most incidents come from a few avoidable situations. These habits address each one.
- Store oils in a closed cabinet, not on a low shelf or bedside table. Cats jump and dogs chew.
- Never apply oils to your pet, including paws, collars and bedding, unless your vet prescribes a specific product.
- Wash your hands after using oils on your own skin before you stroke or hold your pet.
- Check cleaning products and sprays. “Natural” cleaners and room sprays often contain pine, citrus or tea tree oil. Let floors dry before pets walk on them.
- Keep liquid potpourri away from pets entirely. Oklahoma State University vets flag it as dangerous, because it can burn the mouth and skin.
- Use vet-approved flea control. Skip homemade oil sprays and pennyroyal.
- Save emergency numbers in your phone today, before you need them.
Citrus oils show how easily this happens. Their bright scent makes them popular in cleaners and diffuser blends, yet Pet Poison Helpline lists d-limonene as a concern for cats. Our sweet orange oil article covers its uses for people. You can browse all our essential oil guides for individual safety notes.
Common mistakes pet owners make with essential oils
- Treating a hot spot with tea tree oil. This is the most common route to poisoning in the JAVMA data. See a vet for skin problems instead.
- Trusting a “pet-safe oils” list. Tisserand and veterinary sources agree that dose and exposure matter more than the oil’s name.
- Running a diffuser all day. Vapor builds up over hours. Keep sessions under 30 minutes.
- Diffusing in a closed bedroom with a cat. Always leave the door open so your pet can leave.
- Making a pet vomit after swallowing oil. This raises the risk of pneumonia. Call a vet instead.
- Waiting to see if signs appear. With tea tree oil, signs can take up to 12 hours to start. Call for advice right away.
- Forgetting about birds. A diffuser that seems fine for the dog may harm a parrot in the next room.
Your one step today
Gather every essential oil in your home, check the labels against the table above, and move them all into one closed cabinet. Then save the ASPCA Animal Poison Control number, (888) 426-4435, in your phone. Ten minutes now can save a frantic search later.
Free download
Essential Oils and Pets Safety Chart (PDF)
A printable fridge chart: oils to keep away from cats and dogs, warning signs, the 5 emergency steps, diffuser rules and poison control numbers.
This article summarizes published veterinary and safety guidance for educational purposes. It is not a substitute for your veterinarian’s advice and not an instruction to treat any animal. If you think your pet has been exposed to an essential oil, contact your veterinarian or a pet poison line immediately.
Sources
- MSD Veterinary Manual. Toxicoses From Essential Oils in Animals. msdvetmanual.com
- Khan SA, McLean MK, Slater MR. Concentrated tea tree oil toxicosis in dogs and cats: 443 cases (2002–2012). Journal of the American Veterinary Medical Association, 2014. Summarized by Vetstreet: vetstreet.com
- Pet Poison Helpline. Essential Oils and Dogs. petpoisonhelpline.com
- Pet Poison Helpline guidance on cats, as reported by FOX 5 New York, December 2019. fox5ny.com
- Tisserand R. Cats and Essential Oil Safety. Tisserand Institute, 2018, updated 2020. tisserandinstitute.org
- Oklahoma State University Veterinary Medical Hospital. Essential Oils and Pets, 2018. news.okstate.edu
- Ontario SPCA. Are Diffusers Safe to Use Around Pets? 2022. ontariospca.ca
- ASPCA Animal Poison Control Center. aspca.org/pet-care/animal-poison-control
- ASPCA. Toxic and Non-Toxic Plants: Lavender. aspca.org toxic and non-toxic plants list