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"Poisonous" does not mean deadly. Some manifestations of toxicity are subtle. The dose, as always, determines if a plant is safe source of nutrients or a toxic hazard.

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BRIEF: Could hydrangea make my dog puke?

Last night, my beagle(2 yrs old) and cavalier king charles vomited up some carrots and liquid all over our house. The only culprit I can come up with is this dying hydrangea leaf that they were munching on because they've never vomited on carrots before. The leaf they were chewing on was dead and drying with some milky thing on the edge. If you have any info on this, I'd really like to know.


There is an alkaloid found in dried hydrangea leaves that is known to cause vomiting (and thought to have some anti-malarial properties, too). The dried leaves are safer than the fresh ones, especially young leaves or buds. This younger foliage can release cyanide, which would definitely not be good for the pups.