Clustered Dock Toxic?

Updated 2026-03-06| 5 min read| 3,316 found this helpful

The entire plant is toxic, including when processed into dry fodder, with oxalates as the primary toxic component.

Horses and sheep are particularly sensitive to its toxins, while cattle can develop tolerance with gradual low-level exposure.

Severe ingestion can cause heart rhythm abnormalities, kidney damage, and even fatal outcomes in at-risk species.

FAQ

Is Clustered Dock toxic to Humans?

Vomiting, bloody diarrhea, colic, heart arrhythmia, low blood pressure, tonic spasms, tremors, paralysis, blood in urine or anuria, anemia and wasting with prolonged exposure, fatal cases possible. (Low)

Is Clustered Dock toxic to Cats?

No specific toxicity data available for cats; monitor for vomiting, diarrhea, lethargy or urinary changes if ingested, contact a vet immediately. (Low)

Is Clustered Dock toxic to Dogs?

No specific toxicity data available for dogs; monitor for gastrointestinal distress, tremors or reduced urine output if ingested, seek veterinary care promptly. (Low)

Is Clustered Dock toxic to Horses?

Highly sensitive to this plant's toxins; symptoms include depression, excessive salivation, tremors, ataxia, difficulty breathing, potential paralysis, and fatal outcomes in severe cases. (Low)

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Toxicity Details

Humans

Low

Vomiting, bloody diarrhea, colic, heart arrhythmia, low blood pressure, tonic spasms, tremors, paralysis, blood in urine or anuria, anemia and wasting with prolonged exposure, fatal cases possible.

Cats

Low

No specific toxicity data available for cats; monitor for vomiting, diarrhea, lethargy or urinary changes if ingested, contact a vet immediately.

Dogs

Low

No specific toxicity data available for dogs; monitor for gastrointestinal distress, tremors or reduced urine output if ingested, seek veterinary care promptly.

Horses

Low

Highly sensitive to this plant's toxins; symptoms include depression, excessive salivation, tremors, ataxia, difficulty breathing, potential paralysis, and fatal outcomes in severe cases.

Toxicity Snapshot

Toxic PartsEntire plant, including dried plant material used as animal fodder

Exposure RouteIngestion is the only confirmed toxic exposure route

Toxic CompoundsPotassium oxalate (content 2-10%); Free oxalic acid (1% content in leaves); Physcion; Chrysophanol; Emodin; Nepodin; Neposid; Prientalon; Tannins; Potentially accumulated nitrates

First Aid & Prevention

First 30 Minutes

• Immediately stop further consumption of the plant or contaminated fodder.
• Administer oral calcium supplements (if available) to precipitate unabsorbed oxalates.
• Do not induce vomiting unless explicitly instructed by a medical or veterinary professional.
• Collect a sample of the ingested plant to confirm identity for faster treatment.

Contact Vet Immediately

• Any ingestion by horses, sheep, or young children.
• Appearance of symptoms including bloody diarrhea, difficulty breathing, tremors, or reduced urine output.
• Confirmed ingestion of a large quantity of the plant by any species.

Prevention

• Remove clustered dock plants from pastures, fodder stores, and areas accessible to pets and children.
• Avoid feeding livestock hay or fodder known to contain any Rumex genus plants.
• Educate foragers to correctly identify edible wild greens to avoid accidental ingestion.

Treatment & Prognosis

• Administer calcium via stomach tube to precipitate oxalates in the gastrointestinal tract.
• Perform gastrointestinal decontamination appropriate for the species and ingestion timeline.
• Provide symptomatic care including pain relievers, fluid support to protect kidney function, and antihistamines if indicated.
• Monitor heart rhythm, kidney function, and blood parameters for 24-72 hours post ingestion.

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Professional Toxicology

Scientific NameRumex conglomeratus Murray

AliasesKnäuelblütiger Ampfer、Knäuel-Ampfer、Rumex aggloméré、Romice conglomerato

Toxicity Grade

HumansLow

CatsLow

DogsLow

HorsesLow

Target Organs

Gastrointestinal tractKidneysHeartNervous systemCirculatory system

Mechanism of Action

• Soluble oxalates bind to bodily calcium, causing hypocalcemia and calcium oxalate crystal formation that damages tissues, particularly kidneys.

• Anthracene and naphthalene derivatives cause gastrointestinal irritation and additional systemic toxic effects.

• Accumulated nitrates can impair oxygen transport in cases of large ingestion.

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Sheep: High sensitivity; symptoms include depression, excessive salivation, tremors, ataxia, dyspnea, vomiting, and risk of fatal aspiration pneumonia.

Cattle: Develop tolerance to oxalates with gradual, continuous low exposure due to oxalate-degrading microbes in the rumen, reducing toxicity risk.

Confusion Risk

The following plants look similar and may be confused:

Curly Dock Rumex crispus

Closely related Rumex species with similar growth habit and toxicity; differs by having distinctly curled leaf margins and looser flower arrangements.

Broad-leaved Dock Rumex obtusifolius

Common related toxic Rumex species; differs by having wider, rounded leaf tips and more sparsely arranged flower clusters.

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Related Toxic Plants

Rhubarb

Rheum rhabarbarum

High toxicity (leaves)

Japanese Knotweed

Reynoutria japonica

Low to moderate toxicity

Wild Buckwheat

Fagopyrum esculentum

Low toxicity (photosensitization risk)

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Data Sources

1. CliniTox (Universität Zürich)

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