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Can my dog eat walnuts?

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Danger

Walnuts: No, keep it away

Dangerous — black walnuts are toxic, all walnuts are a mold risk.

If your dog ate this, call now

ASPCA Poison Control: (888) 426-4435, or go to your nearest emergency vet. Don’t wait for symptoms.

Black walnuts are toxic to dogs and cause tremors and seizures. Regular walnuts are not directly toxic but are large, high in fat, and often develop mold (particularly Aspergillus) which produces aflatoxins — highly toxic compounds. The high fat content also triggers pancreatitis. Avoid all walnuts.

What makes it harmful: Juglone (black walnuts), aflatoxins (mold)

What to watch for

  • tremors
  • seizures
  • vomiting
  • pancreatitis
  • aflatoxin poisoning

For medium dogs (20–60 lbs)

Avoid completely — mold risk and high fat make them unsafe.

Sources: ASPCA Poison Control, AKC

A quick reference, not a substitute for your vet. If you're worried about your dog, call them.

Questions people ask about walnuts

Can dogs eat Walnuts?
No, dogs should not eat Walnuts. Black walnuts are toxic to dogs and cause tremors and seizures. Regular walnuts are not directly toxic but are large, high in fat, and often develop mold (particularly Aspergillus) which produces aflatoxins — highly toxic compounds. The high fat content also triggers pancreatitis. Avoid all walnuts.
My dog ate Walnuts, what should I do?
Contact your veterinarian or the ASPCA Poison Control: (888) 426-4435 immediately. Do not wait for symptoms. Possible symptoms include: tremors, seizures, vomiting, pancreatitis, aflatoxin poisoning.
How much Walnuts is toxic to a dog?
Even small amounts of Walnuts can be harmful to dogs due to Juglone (black walnuts), aflatoxins (mold). The toxicity depends on the dog's size and how much was consumed. Contact your veterinarian immediately for guidance specific to your situation.
Is Walnuts poisonous to puppies?
Yes, Walnuts is especially dangerous to puppies because they are smaller and their bodies are still developing. Puppies may experience more severe symptoms than adult dogs. Contact a veterinarian immediately if a puppy consumes Walnuts.
Does my dog’s size matter when eating Walnuts?

Small dogs: Any walnut, especially black walnut, is dangerous for small dogs.

Medium dogs: Avoid completely — mold risk and high fat make them unsafe.

Large dogs: Still dangerous — the toxin and fat risks apply to all sizes.

More foods to keep away

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