Conkers contain aesculin and are also a serious intestinal-obstruction risk.
Autumn is the peak season for conker exposure as dogs pick them up on walks.
Conkers (horse-chestnut seeds) contain aesculin, a coumarin glycoside that irritates the GI tract and can cause neurological signs. The hard, round seeds also commonly cause intestinal obstructions, especially in medium to large dogs.
Sources
A single conker can cause GI signs; multiple conkers or a chewed conker can cause both toxicity and obstruction.
Contact your veterinarian or an emergency animal poison hotline immediately. Do not induce vomiting unless instructed by a vet.
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