Horse chestnuts (conkers) contain aesculin, a toxic glycoside that damages dogs severely. Even small amounts can cause acute gastrointestinal upset with vomiting, diarrhea, and abdominal pain, followed by neurological symptoms including tremors, incoordination, and muscle rigidity. The seeds are particularly dangerous; the outer casing is less toxic but still hazardous. Autumn is peak risk season when conkers fall. Keep all horse chestnut seeds completely away from dogs, including those found during walks. If ingestion occurs, contact your vet or emergency clinic with the amount consumed and time of ingestion.
Why Horse Chestnut Should Be Avoided
Conkers contain aesculin which is toxic to dogs; even small amounts can cause severe vomiting.
What To Do If Your Dog Eats Horse Chestnut
Monitor your dog for vomiting, diarrhoea, lethargy, or loss of appetite. If symptoms develop, contact your vet.
Use the Emergency Risk ToolCommon Mistakes
Watch out: Owners may not recognize conkers as poisonous. Children and dogs can pick them up during autumn walks. Some underestimate toxicity severity or delay seeking help. Never assume a small amount is safe; even partial consumption requires veterinary evaluation.
Frequently Asked Questions
Are all parts toxic?
Seeds are most toxic; outer casing is less toxic but still dangerous.
What are the signs of poisoning?
Vomiting, diarrhea, tremors, incoordination, muscle stiffness, excessive salivation.
How quickly do symptoms appear?
Usually within 2-6 hours of ingestion.
Is there an antidote?
No antidote; treatment is supportive care and symptom management.
Should I induce vomiting?
Contact your vet first; they determine best course based on time and amount consumed.
Scientific References
- Vogel G (1970). [Studies on the mechanism of the therapeutic and toxic action of the horse chestnut saponin aescin] PMID: 4246588