Every dog is different. Individual allergies and sensitivities are common — always introduce new foods in small amounts and watch for adverse reactions. This site is for informational purposes only and is not veterinary advice. Always consult your vet.
The Full Picture
Walnuts, especially black walnuts, are dangerous for dogs. Like pecans, they are prone to developing tremorgenic mycotoxins from mould, which can cause seizures, tremors, and neurological symptoms. Along with macadamia nuts, walnuts are among the most dangerous nuts for dogs. Even English walnuts, while not directly toxic, are large enough to be choking hazards and are very high in fat, which can cause pancreatitis. Their size and shape also risk causing intestinal blockage, particularly in smaller dogs. Avoid all walnuts — there are much safer treat options available.
What You Should Know
Walnuts should be kept well away from dogs. If your dog has eaten walnuts, watch for symptoms such as vomiting, diarrhea, lethargy, or loss of appetite. In an emergency, contact your veterinarian or an animal poison helpline straight away.