Sheepkill Toxic?

Updated 2026-03-06| 2 min read| 3,695 found this helpful
Sheepkill
1

All parts of the plant are toxic, with grayanotoxins as the primary toxic principle

2

Confirmed toxic to horses; toxicity to cats and dogs is currently unconfirmed

3

Ingestion can cause severe cardiac, neurological, and gastrointestinal symptoms, possibly leading to death

FAQ

Is Sheepkill toxic to Humans?

No specific human toxicity data documented, but ingestion is expected to cause gastrointestinal, cardiac, and neurological distress similar to effects seen in animals (High)

Is Sheepkill toxic to Cats?

Toxicity unknown, no reported clinical symptom data available (Unknown)

Is Sheepkill toxic to Dogs?

Toxicity unknown, no reported clinical symptom data available (Unknown)

Is Sheepkill toxic to Horses?

Onset within hours of ingestion: digestive upset, excessive drooling, colic, weakness, coordination loss, leg paralysis, weak heart rate, possible coma and death (High)

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Toxicity Details

Humans
High

No specific human toxicity data documented, but ingestion is expected to cause gastrointestinal, cardiac, and neurological distress similar to effects seen in animals

Cats
Unknown

Toxicity unknown, no reported clinical symptom data available

Dogs
Unknown

Toxicity unknown, no reported clinical symptom data available

Horses
High

Onset within hours of ingestion: digestive upset, excessive drooling, colic, weakness, coordination loss, leg paralysis, weak heart rate, possible coma and death

Toxicity Snapshot

Toxic PartsWhole plant
Exposure RouteIngestion of any part of the plant is the primary exposure route
Toxic CompoundsGrayanotoxin I (Acetylandromedol, Andromedotoxin, Rhodotoxin); Grayanotoxin III (Andromedol); Grayanotoxin II (Andromedenol); Grayanotoxins IV to XXI; Rhodojaponines; Grayanoside A; Pieroside A

First Aid & Prevention

First 30 Minutes

  • • Immediately remove remaining plant material from the exposed animal's mouth and restrict further access to the plant
  • • Collect a sample of the ingested plant for veterinary identification if possible
  • • Do not induce vomiting unless explicitly instructed by a licensed veterinarian

Contact Vet Immediately

  • • Any confirmed or suspected ingestion of Kalmia latifolia by any animal
  • • Observation of symptoms including excessive drooling, colic, weakness, or irregular heart rate after exposure
  • • Presentation of severe symptoms such as paralysis, stupor, or loss of consciousness

Prevention

  • • Do not plant Kalmia latifolia in pastures or areas accessible to grazing animals, especially horses, sheep, and goats
  • • Remove wild-growing Kalmia latifolia specimens from animal enclosures and grazing lands
  • • Educate animal owners and farm staff on the visual identification and toxicity risks of this plant

Treatment & Prognosis

  • • Administer appropriate decontamination procedures aligned with the time since ingestion
  • • Provide symptomatic care including analgesics for pain and antibiotics if aspiration pneumonia is diagnosed
  • • Administer 20% intravenous lipid solution at 1.5 mL per kg of body weight over 5 minutes as clinically indicated
  • • Use atropine to treat bradycardia if present
  • • Provide continuous supportive care for cardiac and neurological symptoms
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Professional Toxicology

Scientific NameKalmia latifolia
AliasesMountain Laurel
Toxicity Grade
HumansHigh
CatsUnknown
DogsUnknown
HorsesHigh
Target Organs
Gastrointestinal tractHeartSkeletal musclesNervous systemRespiratory system
Mechanism of Action

• Grayanotoxins interfere with normal function of skeletal muscle, cardiac muscle, and nerve tissue

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Sheep: Will readily graze on the plant, at high risk of severe poisoning with potential fatal outcomes
Goats: Will readily graze on the plant, high risk of life-threatening toxic symptoms post ingestion
Cattle: Symptom onset within 6 hours of ingestion, including apathy, respiratory depression, excessive salivation, abdominal pain, and possible death
Birds: Severely toxic, ingestion can lead to rapid fatal outcomes
Lactating animals: Elevated risk of complications after ingestion, no specific additional symptom data available
Confusion Risk

The following plants look similar and may be confused:

Other Kalmia species Kalmia spp.
Closely related species share similar visual characteristics, all are highly toxic
Catawba Rhododendron Rhododendron catawbiense
Same Ericaceae family with similar evergreen foliage, highly toxic
Japanese Andromeda Pieris japonica
Evergreen Ericaceae shrub with comparable leaf shape, highly toxic
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Related Toxic Plants

Azalea
Azalea
Rhododendron indicum
Highly toxic
Bog Rosemary
Bog Rosemary
Andromeda polifolia
Severely toxic
Western Labrador Tea
Rhododendron groenlandicum
Moderately toxic

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Data Sources

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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