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.
Sources
Large or repeated ingestions are required to reach cyanide-toxicity thresholds, but GI signs occur with small amounts.
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