✓ Reviewed against PDSA, Blue Cross & Animal PoisonLine guidance · Last reviewed: 2026-04
Can dogs eat walnuts?
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The full picture
Walnuts are problematic for multiple reasons. They're high in fat (pancreatitis risk), hard to digest, a choking hazard, and — crucially — they often harbour a mould called Aspergillus that produces tremorgenic mycotoxins. These can cause tremors and seizures within hours of eating mouldy 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.
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
- Mouldy walnuts (found outdoors) are more serious — call the Animal PoisonLine on 01202 509000
Risks to watch for
- Tremors and seizures from mould 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
While you're checking what your dog can safely eat, make sure their flea and worm protection is up to date too.
Common questions
What happens if a dog eats 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
- Mouldy walnuts (found outdoors) are more serious — call the Animal PoisonLine on 01202 509000
What are the symptoms of walnuts poisoning in dogs?
Common signs include: Tremors and seizures from mould mycotoxins; Pancreatitis from fat; Intestinal blockage from shells. Symptoms may appear within hours. Contact your vet immediately.
How much walnuts is toxic to dogs?
There is no safe amount of walnuts for dogs. Even small quantities can cause harm depending on your dog's size and health. Treat any ingestion as potentially serious.
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 Animal PoisonLine on 01202 509000 in the UK.