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Note: A conker is the seed of the horse chestnut tree (not the sweet chestnut tree where we get edible chestnuts from). It is a hard brown nut which is found in a prickly casing. 🌰 Conkers are poisonous to dogs if chewed and eaten due to the presence of gallotannins, a harmful mix of acids; the substance in confers known as aesculin, is toxic. If swallowed whole by dogs conkers can can also cause serious blockages.