How dangerous is hemlock tree poison to dogs?

Hemlock trees aren't poisonous; instead, two related species of plants— Conium maculatum, or poison hemlock, and several members of the genus Cicuta, especially water hemlock, are extremely poisonous. read more

Water hemlock is considered by some sources to be the most poisonous plant in North America. I couldn't find specific information on how poisonous these plants are to dogs, but ingesting even small quantities of these plants can be fatal to humans. It is reasonable to assume that they are equally dangerous to dogs. read more

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Poison hemlock is found in various locations in the United States, namely around water areas such as streams and small rivers. It can also be found on riverbanks, in fields, and in other undisturbed areas. Poison hemlock poisoning in dogs is a result of dogs ingesting any quantity of the poison hemlock plant. read more