Black Walnut

Scientific Name: Juglans nigra

Family: Juglandaceae

Where Found: Native to Northeastern U.S. and Canada.

Toxicity: Non-Toxic to Cats, Toxic to Dogs, Toxic to Horses

Toxic Principles: Unknown

Clinical Signs: Dogs: moldy nuts can grow molds that cause tremors and seizures. Horses: Toxicity usually due to exposure to shavings in bedding;as little as 5% black walnut in bedding can induce a toxic reaction. Ingested nuts and nut hulls have also been implicated in digestive disturbances in horses. Onset of clinical signs as early as 8 hours after exposure to bedding; signs can include mild to moderate depression, anorexia, fluid build up in the legs ("stocking up"), laminitis, increased heart and respiratory rate, increased body temperature, mild colic (on occasion).

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