Can dogs eat walnuts?

Caution

Best avoided. A few plain, unsalted walnuts may not harm a dog, but mouldy walnuts and black walnuts can be toxic.

Also searched as: walnut, black walnuts, black walnut

If your dog has eaten mouldy walnuts or black walnuts, contact your vet.

When it is a problem

AKC says walnuts are not necessarily toxic but are best avoided altogether. They are prone to mould, and black walnuts are described as extremely toxic. The ASPCA notes that nuts such as walnuts are high in oils and fats.

Sources

American Kennel Club: Can dogs eat walnuts? checked 8 October 2026 walnuts are best to avoid altogether. black walnuts are still extremely toxic to dogs
ASPCA: People foods to avoid feeding your pets checked 8 October 2026 Nuts, including almonds, pecans and walnuts, contain high amounts of oils and fats.

Last reviewed 9 October 2026. How we check foods

This is general information, not veterinary advice. If your dog ate something concerning, contact your vet or a poison helpline immediately.