PlantFunMackay's horsetail Toxic?
Contains stable piperidine alkaloids that remain toxic even after the plant is dried, so contaminated hay remains dangerous
All plant parts are toxic, with higher alkaloid concentrations in above-ground tissues that peak in summer and late growth stages
Horses are at highest risk of poisoning, with early vitamin B1 administration being the only curative intervention for early-stage cases
FAQ
Is Mackay's horsetail toxic to Humans?
No confirmed human poisoning cases documented; ingestion may lead to gastrointestinal distress and neurological adverse effects (Low)
Is Mackay's horsetail toxic to Cats?
No specific cat toxicity data available; monitor for appetite loss, diarrhea, and coordination abnormalities if ingestion occurs (Low)
Is Mackay's horsetail toxic to Dogs?
No specific dog toxicity data available; monitor for digestive upset and neurological changes if large volumes are consumed (Low)
Is Mackay's horsetail toxic to Horses?
Loss of appetite, weight loss, reduced milk production, diarrhea, 'staggers disease' from vitamin B1 deficiency, restlessness, coordination loss, hind limb paralysis, blindness, seizures, and death in severe cases (High)
Toxicity Details
No confirmed human poisoning cases documented; ingestion may lead to gastrointestinal distress and neurological adverse effects
No specific cat toxicity data available; monitor for appetite loss, diarrhea, and coordination abnormalities if ingestion occurs
No specific dog toxicity data available; monitor for digestive upset and neurological changes if large volumes are consumed
Loss of appetite, weight loss, reduced milk production, diarrhea, 'staggers disease' from vitamin B1 deficiency, restlessness, coordination loss, hind limb paralysis, blindness, seizures, and death in severe cases
Toxicity Snapshot
First Aid & Prevention
First 30 Minutes
- • Prevent further access to the plant and remove any remaining plant material from the animal's mouth and feed area
- • Do not induce vomiting unless explicitly directed by a licensed veterinarian
- • Collect a sample of the ingested plant for formal identification to guide treatment
Contact Vet Immediately
- • If ingestion is suspected, especially in horses or other large livestock
- • If any signs of appetite loss, coordination impairment, diarrhea, or neurological changes appear
- • If a large volume of plant material was consumed by any animal species
Prevention
- • Routinely inspect pasture, hay, and feed supplies for contamination with Equisetum species
- • Remove all horsetail plants from areas accessible to companion animals and livestock
- • Avoid harvesting forage from areas with confirmed wild horsetail growth
Treatment & Prognosis
- • Perform decontamination and provide symptomatic supportive care per standard veterinary emergency protocols
- • Administer vitamin B1 as prescribed: 100-200 mg orally twice daily on day 1, then once daily for 7-14 days (ideally via feed yeast)
- • Provide targeted supportive care for neurological, gastrointestinal, or other presenting clinical symptoms
Professional Toxicology
• Piperidine alkaloids inhibit thiamine (vitamin B1) activity, leading to severe thiamine deficiency and associated neurological damage
• Alkaloid concentrations remain fully stable after plant drying, so dried plant material in feed is as toxic as fresh material
Information from CliniTox veterinary text.
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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.