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Is a Horsetail Plant Dangerous to Dogs?

By Amy Deemer ; Updated September 21, 2017

Horsetail (Equisetum arvense) is not poisonous to dogs, but is toxic to livestock. Sheep, goats and cattle exhibit signs of poisoning after eating fresh horsetail. Ingesting dried horsetail leads to poisoning in horses. Signs of horsetail poisoning are weakness, weight-loss, clumsiness, breathing difficulties and in severe cases, death.