Downy Oak Toxic?

Updated 2026-03-06| 3 min read| 4,006 found this helpful

All parts of downy oak contain toxic tannins, with unripe fruits, leaves, bark, and buds posing the highest exposure risk

Ruminants typically develop kidney damage and gastrointestinal lesions, while monogastric animals primarily experience digestive symptoms

Oak wood dust is classified as a confirmed carcinogenic substance for exposed humans and animals

FAQ

Is Downy Oak toxic to Humans?

Oak wood dust is a confirmed carcinogen; ingestion of plant parts may cause gastrointestinal irritation, nausea, vomiting, and diarrhea (Moderate)

Is Downy Oak toxic to Cats?

No species-specific data available; expected symptoms include vomiting, diarrhea, and abdominal pain if ingested (Moderate)

Is Downy Oak toxic to Dogs?

No species-specific data available; expected symptoms include vomiting, diarrhea, and abdominal pain if ingested (Moderate)

Is Downy Oak toxic to Horses?

Symptom onset occurs within 24 hours of ingestion, including gastrointestinal irritation, abnormal urine color, weakness, and potential kidney damage (Moderate)

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Toxicity Details

Humans

Moderate

Oak wood dust is a confirmed carcinogen; ingestion of plant parts may cause gastrointestinal irritation, nausea, vomiting, and diarrhea

Cats

Moderate

No species-specific data available; expected symptoms include vomiting, diarrhea, and abdominal pain if ingested

Dogs

Moderate

No species-specific data available; expected symptoms include vomiting, diarrhea, and abdominal pain if ingested

Horses

Moderate

Symptom onset occurs within 24 hours of ingestion, including gastrointestinal irritation, abnormal urine color, weakness, and potential kidney damage

Toxicity Snapshot

Toxic PartsUnripe fruits (higher toxicity than ripe fruits), leaves, bark, buds; oak wood dust is confirmed carcinogenic

Exposure RouteIngestion of plant material, inhalation of oak wood dust

Toxic CompoundsTannins; Catechins; Oligomeric tannins; Catechin gallates; Catechin glycosides; Dimeric proanthocyanidins; Ellagitannins (e.g. vescalagin)

First Aid & Prevention

First 30 Minutes

• Remove all remaining downy oak material from the exposure site and the affected individual's mouth if ingested
• Rinse skin or eyes with clean water immediately if exposed to oak dust or plant sap
• Do not induce vomiting or administer home remedies unless instructed by a medical or veterinary professional

Contact Vet Immediately

• If any pet or livestock has ingested any quantity of downy oak plant material
• If you observe symptoms like abnormal brown urine, diarrhea, loss of appetite, lethargy, or edema after exposure
• If inhalation of oak wood dust causes persistent respiratory irritation or distress

Prevention

• Restrict access of pets and grazing livestock to areas with downy oak, especially during seasons with unripe acorns or new leaf growth
• Wear N95 respiratory protection and eye coverings when cutting, sanding, or processing oak wood to avoid carcinogenic dust exposure
• Regularly remove fallen acorns, leaves, and oak trimmings from areas accessible to pets and livestock

Treatment & Prognosis

• Gastrointestinal decontamination (e.g. activated charcoal administration) under professional supervision to reduce tannin absorption
• Supportive symptomatic therapy including fluid therapy to protect kidney function and manage gastrointestinal lesions
• Symptom-specific care such as anti-diarrheal medication, pain management, and nutritional support as prescribed by a veterinarian

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Professional Toxicology

Scientific NameQuercus pubescens Willd. (syn. Quercus lanuginosa Thuill.)

AliasesPubescent Oak、Provence White Oak、Truffle Oak、Roverella Oak、Soft-haired Oak

Toxicity Grade

HumansModerate

CatsModerate

DogsModerate

HorsesModerate

Target Organs

Gastrointestinal tractKidneysRespiratory tract

Mechanism of Action

• Toxicity is caused by tannins and their metabolic breakdown products

• Tannins damage gastrointestinal mucosa and kidney tissue in susceptible animals

Other Species Risk (CliniTox)

Information from CliniTox veterinary text.

Cattle: Most frequently affected species; symptom onset 3-5 days post-ingestion, including constipation, brown urine, loss of appetite, rumen stasis, bitter-tasting reduced milk production, bloody diarrhea, rapid heart rate, weakness, edema, and potential fatal kidney damage

Other ruminants (sheep, goats): Develop both kidney disease and gastrointestinal lesions following ingestion of toxic plant parts

Monogastric livestock (pigs, poultry): Primarily develop gastrointestinal symptoms including abdominal pain, vomiting, and diarrhea after ingestion

Confusion Risk

The following plants look similar and may be confused:

Other oak species Quercus spp.

Nearly all oak species have similar morphological features and comparable toxicity profiles, making differentiation difficult without specialized botanical knowledge

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Related Toxic Plants

European Beech

Fagus sylvatica

Moderate (Toxic +)

Black Oak

Quercus velutina

High (Strongly Toxic ++)

Northern Red Oak

Quercus rubra

High (Strongly Toxic ++)

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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.