Not veterinary advice. This page is general information from published sources, not a diagnosis. If your dog ate something toxic, call your vet or the ASPCA Animal Poison Control Center at (888) 426-4435 right now (a fee may apply).

🌰 Nuts & Seeds

Can dogs eat walnuts?

Toxic — do not feed
No, walnuts should be avoided because they pose serious mold, fat, and obstruction risks.

Why

Walnuts are not naturally toxic, but they commonly develop Aspergillus mold that produces aflatoxin, and moldy nuts may contain the mycotoxin penitrem A, both of which can cause tremors, seizures, and even death. Black walnuts contain juglone, which is harmful to dogs. Their high fat content can trigger pancreatitis, and whole nuts or shells can cause choking or intestinal blockage.

Warning signs to watch for

Decreased appetite, vomiting, muscle tremors, seizures, and in severe cases death; seek veterinary care immediately.

More foods in this group

🌰 Almonds🥜 Cashews🌰 Macadamia Nuts🥜 Peanut Butter🫘 Pistachios🎃 Pumpkin Seeds

Frequently asked questions

Can dogs eat walnuts?
No, walnuts should be avoided because they pose serious mold, fat, and obstruction risks. Walnuts are not naturally toxic, but they commonly develop Aspergillus mold that produces aflatoxin, and moldy nuts may contain the mycotoxin penitrem A, both of which can cause tremors, seizures, and even death. Black walnuts contain juglone, which is harmful to dogs. Their high fat content can trigger pancreatitis, and whole nuts or shells can cause choking or intestinal blockage.
What are the symptoms if a dog eats too much walnuts?
Decreased appetite, vomiting, muscle tremors, seizures, and in severe cases death; seek veterinary care immediately.
What should I do if my dog ate something toxic?
Call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away (a consultation fee may apply). Have the food, the amount, and your dog's weight ready. Do not induce vomiting without professional guidance.

Source & last checked

  • Safety rating from AKC ↗
  • Last checked: 2026-07-20
  • Every dog is different — size, age, allergies, and health conditions matter. When in doubt, ask your veterinarian before introducing a new food.
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