Why are walnuts bad for dogs?
English walnuts are not strictly poisonous but are fatty and a choking or blockage risk. Black walnuts contain juglone (toxic), and moldy walnuts can carry tremor-causing mycotoxins.
How many walnuts are toxic to dogs?
Zero. Do not feed walnuts. If your dog grabs one or two plain store-bought walnuts, they will likely be fine — but avoid them by default.
Keep all walnuts, especially black walnuts and anything from the yard, away from your dog. Contact a vet if moldy or black walnuts are eaten.
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FAQs
Are walnuts poisonous to dogs?
Black walnuts are. English walnuts are not strictly toxic but are fatty and risky; best avoided.
Why are moldy walnuts dangerous?
They can grow Aspergillus (aflatoxin) or penitrem A, which cause vomiting, tremors, and seizures.
What if my dog ate a walnut?
One or two plain walnuts is usually fine. Call a vet if it was black or moldy, or if many were eaten.