Western Yew Toxic?

Updated 2026-03-06| 5 min read| 3,113 found this helpful

Western Yew is confirmed toxic to cats, dogs, and horses per ASPCA data

Primary toxic compounds are Taxine A, Taxine B, and volatile oils

Even small ingestions can cause acute heart failure and sudden, unexpected death

FAQ

Is Western Yew toxic to Humans?

No confirmed human toxicity data is publicly available, but intentional or accidental ingestion may lead to cardiac distress and neurological symptoms (Low)

Is Western Yew toxic to Cats?

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death (Severe)

Is Western Yew toxic to Dogs?

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death (Severe)

Is Western Yew toxic to Horses?

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death (Severe)

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Toxicity Details

Humans

Low

No confirmed human toxicity data is publicly available, but intentional or accidental ingestion may lead to cardiac distress and neurological symptoms

Cats

Severe

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death

Dogs

Severe

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death

Horses

Severe

Tremors, difficulty breathing, vomiting, seizures, acute heart failure leading to sudden death

Toxicity Snapshot

Toxic PartsAll plant parts (leaves, bark, wood, seeds) are toxic; only the soft, fleshy red aril surrounding seeds is non-toxic, but seeds contained within are highly toxic

Exposure RouteIngestion is the primary high-risk exposure route; skin contact may cause mild, temporary irritation in sensitive individuals

Toxic CompoundsTaxine A; Taxine B; Volatile oil

First Aid & Prevention

First 30 Minutes

• Immediately remove all remaining plant material from the exposed animal's mouth
• Do not induce vomiting unless explicitly directed to do so by a licensed veterinarian
• Document the approximate amount of plant ingested and time of exposure to share with veterinary staff

Contact Vet Immediately

• Any confirmed or suspected ingestion of Western Yew plant material, regardless of quantity
• Observation of symptoms including tremors, labored breathing, vomiting, or seizures
• Unexplained sudden illness in animals that have access to Western Yew plants or clippings

Prevention

• Keep Western Yew plants, pruning clippings, and wood debris fully out of reach of pets and livestock
• Avoid planting Western Yew in residential yards, pastures, or other areas accessible to cats, dogs, or horses
• Clearly label existing Western Yew plants on your property to prevent accidental exposure for people and animals

Treatment & Prognosis

• Veterinary decontamination via activated charcoal administration to bind unabsorbed toxins in the gastrointestinal tract
• Supportive care including continuous cardiac monitoring, oxygen therapy for respiratory distress, and anti-seizure medication as needed
• Targeted pharmaceutical intervention to address cardiac arrhythmias and acute heart failure if they develop

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Professional Toxicology

Scientific NameTaxus brevifolia

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

Toxicity Grade

HumansLow

CatsSevere

DogsSevere

HorsesSevere

Target Organs

HeartCentral nervous systemGastrointestinal tract

Mechanism of Action

• Taxine A and B interfere with cardiac sodium and calcium channel function, disrupting normal heart rhythm and conduction

• Toxic compounds suppress cardiac contractility, rapidly leading to reduced cardiac output and acute heart failure

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Highly toxic; ingestion of even small amounts of clippings often causes sudden death from acute heart failure

Sheep: Severely toxic; exposure typically presents as rapid, unexpected death with no prior visible symptoms

Goats: Moderate to severe toxicity; may show tremors, respiratory distress, and cardiac arrhythmia within 1-2 hours of ingestion

Confusion Risk

The following plants look similar and may be confused:

Canadian Yew Taxus canadensis

Both are evergreen conifers with flat, dark green needles and red fleshy arils; Canadian Yew grows as a low, spreading shrub rather than the upright tree form of Western Yew

Balsam Fir Abies balsamea

Both have flat, dark green needle foliage; Balsam Fir produces upright woody cones and non-toxic foliage, while Western Yew produces red arils and has no visible cones

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Related Toxic Plants

English Yew

Taxus baccata

Severe toxicity

Japanese Yew

Taxus cuspidata

Severe toxicity

Florida Yew

Taxus floridana

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.