Can Dogs Eat Walnuts? No — walnuts are risky

✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last updated: 2026-06-17

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Walnuts are problematic for multiple reasons. They're high in fat (pancreatitis risk), hard to digest, a choking hazard, and — crucially — they often harbor a mold called Aspergillus that produces tremorgenic mycotoxins. These can cause tremors and seizures within hours of eating moldy walnuts. Black walnuts are considered particularly toxic, but all walnuts carry some risk, especially if not fresh. Add the tough shells (which can cause internal damage or blockage) and the verdict is clear: avoid.

Check individual ingredient safety at 247IngredientsCheck.

If your dog has already eaten walnuts

One or two fresh plain walnuts usually cause only mild stomach upset
A larger amount, or any tremors, weakness, or unsteadiness, warrants a vet call
Moldy walnuts (found outdoors) are more serious — call the ASPCA Animal Poison Control Center on (888) 426-4435 or Pet Poison Helpline on (855) 764-7661

Risks to watch for

Tremors and seizures from mold mycotoxins
Pancreatitis from fat
Intestinal blockage from shells
Choking hazard

Safe portion size

None recommended.

Safer alternatives

Blueberries
Plain xylitol-free peanut butter
Carrot pieces

Does size or breed matter?

Walnuts aren't classed as toxic to dogs the way macadamia nuts are, but they're a choking and obstruction risk (particularly whole or in shell) and high in fat, which matters more for small and toy breeds and any dog prone to pancreatitis. Always give plain, unsalted, shelled nuts in small amounts, chopped for smaller dogs.

Common questions

Can dogs eat walnuts?

No. Walnuts can harbor molds producing tremorgenic toxins, are high in fat, hard to digest, and a choking hazard. Black walnuts are especially dangerous.

What if my dog accidentally ate a small amount of walnuts?

For most toxic foods, a very small accidental taste is different from a significant ingestion — a lick is unlikely to cause the same outcome as eating a full serving. That said, some toxins (xylitol, raisins, grapes) have no safe threshold. If you're unsure whether the amount matters, call your vet or the ASPCA Animal Poison Control Center on (888) 426-4435.

Important: This page is general information, not veterinary advice. Every dog is different, and individual factors (age, breed, health conditions, medications) can change what's safe. If in doubt, always contact your vet — or the ASPCA Animal Poison Control Center on (888) 426-4435 or Pet Poison Helpline on (855) 764-7661 in the UK.