Pet safety
Is Black Walnuttoxic to cats & dogs?
Juglans nigra
Quick verdict — at a glance
- Toxic to cats?
- Yes — toxic
- Toxic to dogs?
- Yes — toxic
- ASPCA classification
- Toxic to pets · botanical name Juglans nigra
Is black walnut safe for cats and dogs?
No — black walnut is toxic to cats and dogs. Keep it well away from any pet that chews plants; reactions can be significant. This classification follows the ASPCA Toxic and Non-Toxic Plant List, the most widely used reference for companion-animal plant safety in the US and the standard most UK vets cite as well. Juglans is not individually listed by the ASPCA, but black walnut is a well-documented animal hazard. Moldy nuts and hulls carry tremorgenic mycotoxins (penitrem A) that cause tremors, seizures and vomiting in dogs; the fatty kernels also risk GI upset and pancreatitis. Black walnut wood shavings cause laminitis in horses, and juglone is broadly toxic. Keep fallen nuts, hulls and shavings away from pets and livestock; consult a vet on ingestion.
| Pet | Toxic? | Per ASPCA |
|---|---|---|
| Cats | Yes | Toxic to pets |
| Dogs | Yes | Toxic to pets |
What happens if a pet eats black walnut?
Juglans is not individually listed by the ASPCA, but black walnut is a well-documented animal hazard. Moldy nuts and hulls carry tremorgenic mycotoxins (penitrem A) that cause tremors, seizures and vomiting in dogs; the fatty kernels also risk GI upset and pancreatitis. Black walnut wood shavings cause laminitis in horses, and juglone is broadly toxic. Keep fallen nuts, hulls and shavings away from pets and livestock; consult a vet on ingestion. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to black walnut, treat it as a suspected ingestion and act on the steps below.
What to do if your pet ate black walnut
- Remove any plant material from your pet's mouth and move black walnut out of reach.
- Note how much was eaten and when, and watch for drooling, vomiting, or lethargy.
- Do not induce vomiting unless a vet or poison-control specialist instructs you to.
- Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 and follow their advice.
- Bring a leaf or photo of black walnut to the appointment so it can be treated correctly.
This page is general guidance, not veterinary advice. Pets vary, and a reaction may be to soil, fertiliser, or pesticide rather than the plant. If you are worried, always contact a vet or the ASPCA Animal Poison Control Center on (888) 426-4435 — do not wait for symptoms to worsen.
Pet-safe alternatives to black walnut
Want the same look without the risk? These plants are listed as non-toxic to cats and dogs by the ASPCA and have similar care needs:
- Cucumber — non-toxic to cats and dogs (care guide)
- Lettuce — non-toxic to cats and dogs (care guide)
- Bean — non-toxic to cats and dogs (care guide)
- Pea — non-toxic to cats and dogs (care guide)
Black Walnut and pets — frequently asked questions
Is black walnut toxic to cats?
Black Walnut (Juglans nigra) is toxic to cats according to the ASPCA. Juglans is not individually listed by the ASPCA, but black walnut is a well-documented animal hazard. Moldy nuts and hulls carry tremorgenic mycotoxins (penitrem A) that cause tremors, seizures and vomiting in dogs; the fatty kernels also risk GI upset and pancreatitis. Black walnut wood shavings cause laminitis in horses, and juglone is broadly toxic. Keep fallen nuts, hulls and shavings away from pets and livestock; consult a vet on ingestion. Keep it out of reach and contact your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 if your cat chews it.
Is black walnut toxic to dogs?
Per the ASPCA, Black Walnut (Juglans nigra) is toxic to dogs. Dogs often chew more enthusiastically than cats, so a toxic plant like black walnut is best removed from the floor and low shelves entirely.
What happens if my pet eats black walnut?
Juglans is not individually listed by the ASPCA, but black walnut is a well-documented animal hazard. Moldy nuts and hulls carry tremorgenic mycotoxins (penitrem A) that cause tremors, seizures and vomiting in dogs; the fatty kernels also risk GI upset and pancreatitis. Black walnut wood shavings cause laminitis in horses, and juglone is broadly toxic. Keep fallen nuts, hulls and shavings away from pets and livestock; consult a vet on ingestion. Signs usually appear soon after chewing rather than hours later. If you see drooling, pawing at the mouth, head-shaking, vomiting, loss of appetite, or unusual lethargy after your pet has had access to black walnut, treat it as a suspected ingestion and act on the steps below.
What should I do if my cat or dog ate black walnut?
Stay calm. Remove any remaining plant material from your pet's mouth and take the plant away so they cannot eat more. Note roughly how much was eaten and when. Do not make your pet vomit unless a vet or poison-control specialist tells you to. Call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435 (a consultation fee may apply) and follow their advice. Bringing a photo or a leaf of black walnut to the appointment helps the vet treat it correctly.
What are pet-safe alternatives to black walnut?
If you want a similar look without the risk, good non-toxic swaps include cucumber, lettuce, bean, pea. All of these are listed as non-toxic to cats and dogs by the ASPCA, so they suit a home where pets have access to your plants.
Full black walnut care
Pet-safety is one piece of the picture. For light, watering, soil, and troubleshooting, see the complete black walnut care guide, or browse the full pet-safe plant library to check another plant before you buy it.