Hydrangea contains cyanogenic glycosides in its leaves, buds and flowers.
A few mouthfuls of leaves usually only cause GI upset, but larger ingestions can release significant cyanide.
Hydrangea contains hydrangin, a cyanogenic glycoside that releases hydrogen cyanide when chewed and digested. In practice, dogs rarely eat enough to develop cyanide poisoning, but vomiting and diarrhea are common.
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Large or repeated ingestions are required to reach cyanide-toxicity thresholds, but GI signs occur with small amounts.
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