Can dogs eat walnuts?
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 just eaten walnuts
Do this now
- 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
Unexpected vet bills can run into thousands
One emergency visit for food poisoning can cost £500–£5,000+. Compare UK pet insurance in 60 seconds.
Compare pet insurance →Checked against UK veterinary guidance — see our editorial standards and source list. If your dog has eaten something and you need urgent advice, call a vet or the Animal PoisonLine on 01202 509000.