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A case of canine poisoning with New Zealand Tree Nettle (Ongaonga, Urtica ferox)

The New Zealand Tree Nettle Urtica ferox is known to contain the toxic elements histamine, acetyl choline and 5hydroxytryptamine or serotonin (Blackman and Sumich 1966). Several non-peer-reviewed reports describe the clinical signs observed in people following cutaneous contact which include local discomfort, visual disturbances, respiratory distress, neuromuscular signs, collapse and death (Connor 1977; Clark 1993; McGouran 2010). Anecdotal reports of severe cases in dogs describe intense pain, the loss of scenting ability, convulsions and death. Deaths have also been reported in horses (Connor 1977). There is widespread anecdotal awareness, but published reports of poisonings and treatment protocols are scarce in the human literature (McGouran 2010) and rare in the veterinary literature.