Can Dogs Eat Black Walnuts?

NoCall a vet within hours
Verdict for dogs: Toxic · Evidence: H · Last verified: 2026-11-01 (seed data — veterinary review pending)

No. Black Walnuts is toxic to dogs. It contains juglone and tremorgenic mycotoxins from mold (the most dangerous walnut). There is no amount we can call safe, so it should stay off the menu. If your dog has already eaten some, contact your veterinarian or a pet poison hotline right away.

Your dog already ate some?
Don't wait for symptoms. Call your veterinarian now, or a pet poison hotline:
ASPCA Animal Poison Control (US): (888) 426-4435 (a fee may apply) · Pet Poison Helpline (US/CA): (855) 764-7661 (a fee applies)

Why it is toxic

juglone · tremorgenic mycotoxins from mold (the most dangerous walnut)

Which parts are the problem?

shells

Dose & exposure rules

Fallen yard nuts especially carry mold and juglone exposure: tremors and seizures are the documented signs

If it must be on the menu: safe preparation

None recommended — black walnuts are a known toxicity source for dogs

Symptoms to watch for

tremorsseizuresGI upset

Hours

What to do now

Vet if any amount was eaten — this is the walnut to fear

✔ Reviewed against ASPCA · Pet Poison Helpline. Veterinary review pending — this page will carry a named, licensed veterinarian's sign-off after review (see team and editorial policy). General information only, not veterinary advice.

FAQ

How much black walnuts can a dog eat?

Fallen yard nuts especially carry mold and juglone exposure: tremors and seizures are the documented signs

What are the signs of black walnuts problems in dogs?

Watch for: tremors; seizures; GI upset. Hours

What should I do if my dog ate black walnuts?

Vet if any amount was eaten — this is the walnut to fear

Related:

Can cats eat black walnuts?

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