Are Black Walnuts Toxic to Horses?
Yes — black walnuts are toxic to horses.
PawSafe Check is for general information only and is not veterinary advice. Always contact your veterinarian or a poison control service if you think your pet has been exposed.
Symptoms to watch for
- Vomiting
- Diarrhea
- Drooling
- Reduced appetite
Toxic parts
Moldy nuts and hulls; wood shavings for horses
Toxic compound
Tremorgenic mycotoxins (in moldy nuts); juglone
What to do now
- Call your vet or a pet poison control line immediately — don't wait for symptoms.
- Do not induce vomiting unless a vet tells you to.
- Bring the plant, label or packaging with you so the vet knows exactly what your horse ate.
- Note roughly how much was eaten and when.
Good to know
Moldy walnuts can cause tremors and seizures in dogs. Black walnut shavings in bedding can cause laminitis in horses.
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Frequently asked questions
Can horses eat black walnuts?
No. Yes — black walnuts are toxic to horses.
Are black walnuts toxic to horses?
Yes — black walnuts are toxic to horses. Moldy walnuts can cause tremors and seizures in dogs. Black walnut shavings in bedding can cause laminitis in horses.
What are the symptoms of black walnuts poisoning in horses?
Vomiting. Diarrhea. Drooling. Reduced appetite.
What should I do if my horse ate black walnuts?
Call your vet or a pet poison control line immediately — don't wait for symptoms. Do not induce vomiting unless a vet tells you to. Bring the plant, label or packaging with you so the vet knows exactly what your horse ate. Note roughly how much was eaten and when.
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