Is Eucalyptus Toxic to Dogs and Cats? Oil and Plant Risks

Name: Is Eucalyptus Toxic to Dogs and Cats? Oil and Plant Risks
Creator: Dr. Zubair Khalid

By Dr. Zubair Khalid, DVM, MS, PhD · 2026-10-03

Eucalyptus is toxic to dogs and cats, and the risk climbs sharply when you move from a leaf on the floor to a bottle of concentrated oil. Chewing a leaf usually causes drooling, vomiting, and diarrhea, while diffusers, sprays, and essential oil bottles can lead to much more serious problems [1]. This article is educational and is not a substitute for veterinary diagnosis or treatment.

Quick Answer

Eucalyptus plants are listed as toxic to dogs and cats, with eucalyptol as the toxic principle and salivation, vomiting, diarrhea, depression, and weakness as the expected signs [1].
Concentrated eucalyptus oil is the bigger danger. A diffuser, room spray, or open bottle exposes your pet to a dose far beyond what a leaf contains.
Cats are especially vulnerable because they clear many essential oil compounds slowly, and safe intake levels for cats are set far lower than for dogs [2].
If your pet chewed a leaf and is drooling or vomiting, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435.
Never induce vomiting unless a veterinarian tells you to. Some oils and plant material can cause more harm coming back up.

Is Eucalyptus Toxic to Cats and Dogs?

Yes. Eucalyptus species are classified as toxic to dogs, cats, and horses, and the plant's essential oils, mainly eucalyptol, are the reason [1]. That classification covers the plant itself. It does not mean every exposure is an emergency, but it does mean you should treat eucalyptus as a plant that does not belong within your pet's reach.

Which parts of the plant matter

The leaves are the main concern because they hold the oil. Dried leaves in a sachet, fresh branches in a shower bundle, and leaves that drop from a potted tree all carry the same oils. A pet who chews and swallows a leaf or two may only get a mouthful of strong-tasting plant material. A pet who eats a pile of dried leaves has taken in more oil.

Which products matter more

Concentrated products carry far more risk than the plant:

Essential oil bottles, including tiny sample vials
Diffusers that run for hours in a closed room
Room sprays, linen sprays, and pillow mists
Ointments, balms, and massage oils
Shampoos and grooming products that list eucalyptus oil
Candles and wax melts with eucalyptus fragrance

A diffuser does not require your pet to eat anything. Dogs and cats absorb airborne oil through their noses and lungs, and cats then groom the residue off their coats. That is a real exposure route, and it is why a diffuser in a small bedroom can affect a cat who never touches the bottle.

If you use essential oils at home, our guide to whether essential oils are safe for cats and dogs walks through the general principles.

What Eucalyptol Does in the Body

Eucalyptol is the main active compound in eucalyptus oil [1]. When a pet swallows it, the oil irritates the lining of the mouth, stomach, and intestines. That irritation is what drives the drooling, vomiting, and diarrhea that veterinarians expect to see [1].

The oil does not stay in the gut. It is absorbed and then processed by the liver. Cats are less efficient at clearing many of these compounds, which is why regulatory safety work sets a much lower acceptable intake for cats than for dogs. In one safety assessment, the level considered safe in complete feed was 58 mg/kg for dogs and only 10 mg/kg for cats [2]. That gap is not a dosing instruction for your pet. It is a signal that cats handle these oils very differently, and it explains why a diffuser that seems harmless to your dog can affect your cat.

At higher absorbed doses, oils can depress the nervous system. That is where the depression and weakness listed for eucalyptus poisoning come from [1]. In severe cases, pets can become unsteady, dull, or difficult to rouse.

Signs of Eucalyptus Poisoning and How Fast They Appear

Signs depend on how much was eaten, what form it was in, and how big your pet is.

Mild to moderate exposure

Drooling or lip smacking
Vomiting
Diarrhea
Refusing food
Acting quiet or depressed
Weakness or wobbliness [1]

These signs often show up within an hour or two of a pet eating leaves or licking a product. Drooling may start within minutes because the taste and the irritation hit the mouth first.

Severe exposure

Repeated vomiting that will not stop
Marked weakness or collapse
Depression that deepens into unresponsiveness
Tremors or uncoordinated movement
Breathing that looks labored or unusually slow
Burns or redness in the mouth after contact with undiluted oil

Severe signs are most likely after a pet drinks from an oil bottle, chews a punctured capsule, or spends hours in a small, closed room with a running diffuser. A cat who grooms concentrated oil off her coat can also take in a meaningful dose without ever eating the plant.

Skin and eye contact

Undiluted oil on the skin can cause redness and irritation. Oil in the eye causes pain, squinting, and tearing. Rinse the area with plain water and call your veterinarian or a poison control line for guidance.

What to Do Right Now

Stay calm and act in this order.

Move your pet away from the source. Put the plant, bottle, diffuser, or sprayed item out of reach, and open a window if the exposure was airborne.
Check your pet's mouth. Look for leaves, plant material, or oil residue. Wipe the outside of the mouth with a damp cloth if there is oil on the fur or lips.
Call for advice. Contact your veterinarian, the ASPCA Animal Poison Control Center at (888) 426-4435, or Pet Poison Helpline at (855) 764-7661. Have the product label, the plant, or a photo ready.
Do not induce vomiting unless a veterinarian tells you to. Vomiting up oil can lead to aspiration, and the advice depends on what your pet swallowed.
Do not give food, milk, oil, or home remedies to "soak up" the toxin. These can make vomiting worse or delay proper care.
Keep your pet warm, quiet, and watched. Note the time of exposure and any signs so you can report a clear timeline.

If your pet is collapsing, having trouble breathing, or cannot be woken, skip the phone call and go straight to the nearest emergency veterinary hospital.

How Veterinarians Treat Eucalyptus Exposure

Treatment is supportive and depends on the signs. Your veterinarian will ask what form of eucalyptus was involved, how much, and when.

For a pet who only ate a small amount of leaf and is mildly drooling, care may be limited to monitoring at home with clear instructions on what to watch for. For a pet with repeated vomiting or diarrhea, the veterinarian may give fluids under the skin or into a vein to correct dehydration. Medications to control nausea and protect the stomach lining are common.

If the exposure was recent and the amount was large, the veterinarian may decontaminate. That could mean inducing vomiting in a controlled way or giving activated charcoal, but only when it is safe for that specific patient. A pet who is already weak, vomiting, or unresponsive is not a candidate for those steps.

Pets with nervous system signs need closer monitoring. That may include blood work, oxygen support, and intravenous fluids. There is no antidote that reverses eucalyptol. The body has to clear it while the veterinary team supports breathing, circulation, and comfort.

The dose of any medication is calculated by your veterinarian from your pet's weight, species, and current health. No dose should be guessed at home.

Outlook After Eucalyptus Exposure

Most pets who eat a small amount of eucalyptus leaf and develop only mild stomach upset recover well with supportive care. Signs usually settle within a day or two once the plant material has passed.

Pets with heavy oil exposure take longer and need more support. The outlook is better when the pet is seen early, before nervous system signs set in. Cats exposed to a diffuser in a closed room often improve once they are moved to fresh air and given fluids, but they should still be evaluated.

Any pet who needed treatment for nervous system signs should be rechecked. Your veterinarian may want to repeat blood work to confirm the liver and kidneys are handling the exposure normally.

Prevention and Safer Alternatives

The simplest prevention is to keep eucalyptus out of your home and yard.

Do not keep eucalyptus as a houseplant if you have a cat or dog.
Skip dried eucalyptus bundles in the shower, in wreaths, and in closets.
Choose diffusers that are not used at all in rooms your pets can enter, or skip them entirely.
Store essential oil bottles in a closed cabinet, not on a counter or nightstand.
Read labels on balms, sprays, and grooming products before you buy.
Never apply an essential oil to your pet's skin or coat.

If you want the scent of eucalyptus without the risk, look for pet-safe options. Unscented candles, plain simmer pots with pet-safe herbs, or simply opening a window can give you a fresh-smelling home without airborne oils. For plant lovers, there are many nontoxic houseplants that give you greenery without the worry. Our list of plants that aren't toxic to cats and dogs is a good starting point, and if you garden outdoors, plants poisonous to dogs covers what to avoid in the yard.

If you are choosing plants for a home in a warmer climate, what plants are toxic to cats in Australia is a useful cross-check, since many of the same species appear in U.S. gardens and nurseries.

One more caution. Do not assume that a product marketed for pets is safe just because it is sold as a supplement or a "natural" remedy. Analysis of canine and feline dietary supplements sold in the United States found lead in 16 products and cadmium in 10, which shows that labels do not always match what is inside [3]. Check with your veterinarian before giving your pet any oil, capsule, or supplement.

Limitations and When to Contact a Veterinarian

This article covers general principles. Your pet's individual case needs a veterinarian who can examine them, ask about the exact product, and decide on treatment.

Contact your veterinarian the same day if your pet:

Ate eucalyptus leaves and is drooling, vomiting, or has diarrhea
Licked or drank a small amount of diluted product
Was in a room with a diffuser and seems dull or off
Has redness or irritation on the skin or in the mouth

Go to an emergency hospital now if your pet:

Is weak, wobbly, or cannot stand
Is difficult to wake or unresponsive
Is vomiting repeatedly and cannot keep water down
Is breathing fast, slow, or with effort
Has tremors or a seizure

Schedule a routine visit if your pet had a brief, mild exposure and seems normal now. A checkup can confirm there are no lingering effects, especially for cats, who hide illness well.

Frequently Asked Questions

Is one eucalyptus leaf dangerous for my dog?

A single chewed leaf often causes only mild mouth irritation, drooling, or an upset stomach. The risk rises with the number of leaves, whether they were dried and concentrated, and your dog's size. Call your veterinarian or a poison control line for advice based on what you actually saw your dog eat.

Can I use a eucalyptus diffuser around my cat?

It is safer not to. Cats absorb airborne oil and then groom it off their coats, and their bodies clear these compounds more slowly than dogs do. If you must use one, keep it in a room your cat cannot enter and ventilate well afterward.

My pet licked eucalyptus oil off the floor. What now?

Wipe the mouth and any oil on the fur, then call your veterinarian or a poison control line right away. Do not wait for signs, because oil absorbed from the mouth and skin can cause problems that are easier to manage when caught early. Do not induce vomiting on your own.

Does eucalyptus smell alone hurt pets?

Strong, lingering fragrance in a closed space can irritate a pet's eyes, nose, and airways, and it counts as an exposure route for oils. Move your pet to fresh air and watch for drooling, coughing, or unusual tiredness. If signs appear, call your veterinarian.

Are eucalyptus shampoos and balms safe for pets?

It depends on the product and the species, and many are not intended for cats. Do not apply any eucalyptus product to your pet unless your veterinarian specifically recommends it for your pet's condition. If a product was applied and your pet is licking at it, call your veterinarian for guidance.

References

Toxic and Non-toxic Plants: Eucalyptus. ASPCA Animal Poison Control Center.
Safety and efficacy of a feed additive consisting of an essential oil derived from Eucalyptus globulus Labill. (eucalyptus oil) for all animal species (FEFANA asbl). EFSA journal. European Food Safety Authority, 2023.
Analysis of Essential Minerals and Heavy Metals in Canine and Feline Dietary Supplements Marketed in the United States. Journal of animal physiology and animal nutrition, 2026.