Toxic and Non-Toxic Plants for Dogs, Cats and Horses: A Vet’s Safety Guide

By Dr Duncan Houston.

A beautiful bouquet, a new houseplant or freshly trimmed garden branches can create an unexpected poisoning risk for animals. Some plants cause temporary irritation, while others can damage the heart, liver, kidneys or nervous system.

Plant safety depends on the exact plant, the animal species, the part eaten and the amount involved. A plant described as safe for dogs is not automatically safe for cats or horses.

This guide covers important examples, safer alternatives and what to do after a suspected exposure. It is not an exhaustive plant list.

Quick Answer

If your animal eats a potentially poisonous or unidentified plant:

Prevent further access.
Contact your veterinarian or an animal poison service immediately.
Photograph the plant and keep its identification label.
Note what was eaten, approximately how much and when.
Do not induce vomiting or give home remedies unless specifically instructed.
Do not wait for symptoms after exposure to a high-risk plant.

Any suspected exposure to true lilies or daylilies in a cat requires immediate veterinary attention, even if the cat appears well.

What to Do After a Suspected Plant Poisoning

1. Move Your Animal Away

Remove access to the plant, fallen material, vase water or contaminated feed. Keep other animals away too.

Do not put yourself at risk by reaching into a frightened animal’s mouth.

2. Call for Professional Advice

Have the following information ready:

Animal species, age and approximate weight
Existing health conditions and medications
Plant name, label or photographs
Plant part involved, such as leaves, seeds, bulbs or pollen
Estimated amount and time of exposure
Any symptoms already present

For a horse, contact your equine veterinarian promptly and ask whether other horses sharing the pasture, hay or bedding may also be at risk.

3. Collect Identification Information

Photograph the whole plant, leaves, flowers, berries and stems. If safe, place a small sample in a sealed container and take it to the clinic.

Do not delay treatment while trying to achieve a perfect identification. Phone apps and image searches can suggest possibilities, but they cannot reliably rule out poisoning.

4. Avoid Home Remedies

Do not give salt, oil, milk, activated charcoal or hydrogen peroxide unless a veterinarian or veterinary poison professional specifically directs you to do so.

Never attempt to induce vomiting in a horse. Cats also require veterinary treatment rather than at-home vomiting remedies. The ASPCA warns that attempts to induce vomiting at home can themselves cause serious harm.

When Is It an Emergency?

Seek emergency veterinary care for:

Difficulty breathing or swallowing
Collapse, severe weakness or inability to stand
Tremors, seizures or marked disorientation
Repeated vomiting or bloody diarrhoea
Severe abdominal pain
Abnormal bleeding
Pale, blue or yellow gums
Severe colic, sweating or weakness in a horse

A lack of symptoms does not prove the exposure was harmless. Some plant toxins cause delayed organ damage, so advice should be based on the exposure as well as how the animal currently looks.

Poison Helplines

Save your regular veterinarian’s number and your nearest emergency clinic’s details before you need them.

Location	Service	Telephone
Australia	Animal Poisons Helpline	1300 869 738
New Zealand	Animal Poisons Helpline	0800 869 738
United States	ASPCA Poison Control	888-426-4435

These services advertise round-the-clock assistance. Consultation charges may apply. Confirm current arrangements through the Animal Poisons Helpline or ASPCA Poison Control.

Outside these regions, contact your local veterinarian or emergency hospital. Do not assume that owning a particular microchip automatically provides free poison consultations.

Important Toxic Plants to Recognise

True Lilies and Daylilies: A Cat Emergency

Plants in the Lilium and Hemerocallis groups can cause fatal kidney failure in cats. Examples include Easter lilies, tiger lilies, stargazer lilies and daylilies.

Dangerous exposures include:

Chewing leaves or petals
Licking pollen from the coat
Drinking water from the vase

Removing the stamens does not make the plant safe. Keep these lilies entirely out of homes with cats.

If pollen gets on your cat, prevent grooming if you can do so safely and contact an emergency veterinarian immediately for decontamination instructions. Do not delay transport. The FDA explains that even small exposures can cause severe kidney injury.

Other High-Risk Plants

Plant	Scientific name	Main concern
Sago palm and related cycads	Cycas revoluta and related species	Severe liver injury, gastrointestinal illness and bleeding problems
Oleander	Nerium oleander	Dangerous heart rhythm disturbances
Autumn crocus	Colchicum autumnale	Severe gastrointestinal illness and potentially multiple-organ damage
Castor bean plant	Ricinus communis	Ricin poisoning, particularly from chewed seeds
Azaleas and rhododendrons	Rhododendron species	Gastrointestinal, cardiovascular and neurological effects
Yew	Taxus species	Potentially fatal cardiac poisoning

The ASPCA’s plant safety overview describes sago palm, oleander and autumn crocus hazards. Its castor bean entry and the Merck Veterinary Manual’s ornamental plant guidance provide further toxicology information.

Do not try to calculate a “safe number” of leaves or seeds yourself. Contact a professional after suspected ingestion.

Not All Toxic Plants Cause the Same Type of Illness

Some plants primarily irritate the mouth or digestive tract, while others cause systemic poisoning.

For example:

Peace lilies and calla lilies can cause painful oral irritation, drooling and difficulty swallowing. They are not the same as the kidney-toxic true lilies.
Snake plants, also called mother-in-law’s tongue, can cause vomiting and diarrhoea.
Tulips can cause gastrointestinal signs, with the highest toxin concentration in the bulb.

These distinctions matter, but “less dangerous than a true lily” does not mean harmless. The FDA explains the different lily groups, while ASPCA entries describe snake plant and tulip toxicity.

Non-Toxic Plant Options for Dogs and Cats

The following are commonly listed as non-toxic to dogs and cats when correctly identified.

Common name	Scientific name
Spider plant	Chlorophytum comosum
Boston fern	Nephrolepis exaltata
Cast iron plant	Aspidistra elatior
Moth orchid	Phalaenopsis species
Baby rubber plant	Peperomia obtusifolia
Pot marigold	Calendula officinalis

The ASPCA’s pet-friendly houseplant guide includes the first five options. Its garden marigold entry specifically identifies Calendula officinalis as non-toxic to dogs and cats.

Non-toxic does not mean edible or suitable for unlimited chewing. Plant material can still cause digestive upset, and pots, fertilisers or chemical treatments may introduce separate hazards.

These are dog-and-cat examples, not a list of suitable horse forage.

Why Common Names Can Be Misleading

Check the scientific name before buying a plant.

A Boston fern is not the same plant as an asparagus fern.
A baby rubber plant is not the same as every plant sold as a rubber tree.
“Marigold” can refer to different plants. A listing for Calendula officinalis cannot be applied to every marigold.
“Lily” covers unrelated plants with very different toxic effects.

A nursery label, botanical identification and species-specific toxicity entry are more useful than a broad “pet-friendly” description.

Special Plant Risks for Horses

Horses can encounter toxins through grazing, contaminated hay, hedge clippings and bedding.

Important examples include:

Hazard	Why it matters
Wilted or dried red maple leaves, Acer rubrum	Can damage red blood cells and cause severe illness
Black walnut shavings, Juglans nigra	Bedding exposure can cause laminitis
Yew clippings, Taxus species	Can cause rapidly fatal cardiac poisoning

These hazards are described in the Merck Veterinary Manual’s poisonous range plant reference.

For prevention:

Never tip garden or hedge clippings into paddocks.
Check boundary trees and neighbouring gardens.
Inspect pasture after storms or pruning.
Buy hay and bedding from reliable suppliers.
Avoid overgrazing and maintain suitable forage.
Ask your equine veterinarian or local agricultural adviser about regional weeds.

Plant risks vary by location. A North American plant list will not cover every Australian or Asian pasture hazard. Merck emphasises pasture management and local plant knowledge in preventing livestock poisoning.

How to Use the ASPCA Plant Database

The ASPCA Toxic and Non-Toxic Plants database is a useful starting point.

Search the plant’s common and scientific names.
Check the listing for your animal species.
Compare photographs with the plant label and identifying features.
Read the toxic parts and potential clinical signs.
Contact your veterinarian if identification remains uncertain.

An absent listing does not prove a plant is safe. The database supports identification and prevention, but it does not replace an individual exposure assessment.

Could Something Else Be Causing the Symptoms?

Vomiting, drooling, weakness and diarrhoea are not specific to plant poisoning. Your veterinarian may also consider:

Fertilisers, pesticides or slug bait
Toxic mushrooms or mouldy compost
Swallowed bulbs, stones or other foreign material
Dietary indiscretion
Infectious or inflammatory disease
Unrelated kidney, liver or neurological illness

Mention everything your animal may have accessed, including potting products and garden chemicals.

What Treatment Might Be Needed?

Treatment depends on the plant, animal species, timing and clinical condition. Your veterinarian may recommend:

Immediate stabilisation
Appropriate decontamination
Blood tests and urine testing
Intravenous fluids
Medication for vomiting, seizures or cardiac abnormalities
Hospitalisation and repeat monitoring

There is no universal antidote for plant poisoning. Early treatment may be needed before blood tests become abnormal. The ASPCA explains what to expect after a toxin exposure at an emergency veterinary hospital.

Common Mistakes to Avoid

Waiting for symptoms after a high-risk exposure
Assuming animals instinctively avoid poisonous plants
Treating “natural” as a guarantee of safety
Assuming a high shelf keeps plants away from cats
Relying solely on an image-identification app
Giving home remedies
Assuming dried leaves or clippings are harmless
Applying a dog-safe plant list to horses
Using training as the only protection against access

Frequently Asked Questions

My cat only brushed against a lily. Should I worry?

Yes, if pollen may be on the coat and could be swallowed during grooming. Prevent grooming if safe and contact an emergency veterinarian immediately.

Are non-toxic plants completely safe?

No. They are not expected to cause the plant-specific poisoning associated with toxic species, but chewing them may still cause digestive upset or other problems.

Should I make my dog vomit?

Only if a veterinarian or veterinary poison professional specifically instructs you to do so. Whether vomiting is appropriate depends on the exposure and your dog’s condition.

Can I keep a toxic plant if my pet has never chewed plants?

Past behaviour does not guarantee future safety. Removing highly hazardous plants is more reliable than assuming your animal will ignore them.

Can I wait until morning if my pet looks normal?

Do not make that decision without professional advice. Delayed symptoms are possible, and early treatment can be important.

Final Thoughts from Dr Duncan Houston

You do not need to memorise every poisonous plant. Knowing what grows in your home, garden and paddock, checking exact plant names and keeping emergency contacts ready will make you better prepared.

If an exposure happens, act on the possibility of poisoning rather than waiting for proof. A quick call is far better than discovering too late that an attractive plant carried a serious risk.

Build a Safer Home with ASK A VET™

Not sure where to start with pet-proofing your home or reviewing garden risks? Visit ASK A VET™ or download the app for veterinary guidance and support with everyday animal care.

Keep plant photographs, exposure details and veterinary instructions together so important information is ready when you need it.

For suspected poisoning, contact your veterinarian or a dedicated animal poison service immediately. Do not wait for an app reply or online identification before seeking emergency care.

Talk. Track. Trust. ASK A VET™.