Japanese Yew Toxic?

Updated 2026-03-06| 5 min read| 1,783 found this helpful

Taxus sp.

All parts of yew (except the fleshy red seed aril) are toxic to common companion and livestock animals even in small doses.

Ingestion can trigger rapid onset of acute heart failure and sudden death, often before obvious symptoms appear.

Primary toxic compounds driving harmful effects are taxine A and B, which target cardiac and nervous system function.

FAQ

Is Japanese Yew toxic to Humans?

No explicit human symptom data provided; expected effects include cardiac arrhythmia, tremors, respiratory distress, and potential cardiac failure if ingested. (Severe)

Is Japanese Yew toxic to Cats?

Muscular tremors, difficulty breathing, vomiting, seizures, and sudden death from acute heart failure. (Severe)

Is Japanese Yew toxic to Dogs?

Muscular tremors, dyspnea, vomiting, seizures, and rapid onset of acute heart failure leading to sudden death. (Severe)

Is Japanese Yew toxic to Horses?

Muscular tremors, respiratory distress, unsteadiness, seizures, and fatal acute heart failure. (Severe)

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Toxicity Details

Humans

Severe

No explicit human symptom data provided; expected effects include cardiac arrhythmia, tremors, respiratory distress, and potential cardiac failure if ingested.

Cats

Severe

Muscular tremors, difficulty breathing, vomiting, seizures, and sudden death from acute heart failure.

Dogs

Severe

Muscular tremors, dyspnea, vomiting, seizures, and rapid onset of acute heart failure leading to sudden death.

Horses

Severe

Muscular tremors, respiratory distress, unsteadiness, seizures, and fatal acute heart failure.

Toxicity Snapshot

Toxic PartsAll plant parts except the fleshy, red, cup-shaped aril surrounding the seed; leaves, bark, wood, and seeds are all toxic.

Exposure RoutePrimary exposure route is ingestion; skin contact may cause mild localized irritation in sensitive individuals.

Toxic CompoundsTaxine A; Taxine B; Volatile oil

First Aid & Prevention

First 30 Minutes

• Immediately remove any remaining plant material from the exposed animal's mouth and move them away from the yew source.
• Do not induce vomiting or administer home remedies unless explicitly instructed to do so by a veterinary professional.
• Collect a sample of the ingested plant to provide to your vet for fast identification.

Contact Vet Immediately

• Any confirmed or suspected ingestion of yew plant material, even if no symptoms are yet visible.
• Appearance of symptoms including tremors, difficulty breathing, vomiting, unsteadiness, or seizures.
• Sudden unexplained collapse or lethargy after potential access to yew plants.

Prevention

• Remove all yew plants from yards, pastures, and spaces accessible to pets, horses, and other grazing livestock.
• Do not use yew clippings as mulch, decorative greenery, or compost in areas accessible to animals.
• Clearly label ornamental yew plants on private and public property to warn animal owners of toxic risk.

Treatment & Prognosis

• Veterinary decontamination including induced vomiting, activated charcoal administration, and gastric lavage for recent ingestion cases.
• Supportive care including IV fluids, anti-seizure medication, and continuous cardiac monitoring to address arrhythmias.
• Extended monitoring for 24-48 hours post-exposure to catch delayed cardiac or neurological adverse effects.

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Professional Toxicology

Scientific NameTaxus sp.

AliasesEnglish Yew、Western Yew、Pacific Yew、Anglo-Japanese Yew

Toxicity Grade

HumansSevere

CatsSevere

DogsSevere

HorsesSevere

Target Organs

HeartCentral Nervous SystemRespiratory System

Mechanism of Action

• Taxine A and B act as calcium and sodium channel antagonists in cardiac myocytes, disrupting normal heart rhythm and causing acute cardiac failure.

• Toxic alkaloids also suppress central nervous system function, triggering tremors, seizures, and respiratory depression.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Highly toxic, ingestion often causes sudden cardiac death with minimal premonitory symptoms.

Sheep: Severe toxicity reported; small volumes of ingested yew trigger cardiac failure and neurological symptoms.

Goats: Toxic; exposure causes tremors, respiratory distress, and potentially fatal cardiac arrest.

Confusion Risk

The following plants look similar and may be confused:

Common Boxwood Buxus sempervirens

Both have small, glossy dark green evergreen leaves and are widely used as ornamental hedges; yew produces distinctive red fleshy arils, while boxwood forms small dry brown seed capsules with no red fruit structures.

Common Juniper Juniperus communis

Both are compact evergreen conifers with small foliage; juniper produces blue/purple berry-like seed cones, while yew produces unique red, cup-shaped arils around its seeds.

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Related Toxic Plants

Florida Yew

Taxus floridana

Severe toxicity

California Nutmeg

Torreya californica

Moderate toxicity

Chinese Plum Yew

Cephalotaxus fortunei

High toxicity

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Data Sources

1. ASPCA Animal Poison Control

This information is for reference only and does not constitute medical advice. If ingestion or poisoning is suspected, seek medical or veterinary attention immediately.

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