Native to Northeastern U.S. and Canada.
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).
Toxic to Dogs
Toxic to Horses
Non-Toxic to Cats