Walnuts are oily tree nuts sold in-shell, shelled halves, chopped pieces, and snack mixes for baking and casual eating. English walnuts are the common edible type, while black walnuts and moldy walnuts are higher-risk exposures for pets. The nuts are calorie-dense and high in fat.
Walnuts are used in brownies, cookies, granola, salads, and trail mix, often with chocolate, raisins, salt, or sweet glazes. Nut pieces are small and easy to swallow whole. Stored walnuts can turn rancid or grow molds that produce tremorgenic mycotoxins.
For pets, walnuts are not recommended treats. Fat-rich nuts may cause vomiting, diarrhea, or pancreatitis in sensitive animals. Keep baking bowls, shell debris, and fallen backyard walnuts out of reach.
Walnut trees drop nuts and husks in autumn, and yard foraging is a common exposure route. Cracked shells may hide in grass and mulch after cleanup. Prompt removal lowers choking and mold-related risk.
Compost piles with old nuts and husks should also be secured.
