To preserve freshness, nuts should be stored in the freezer. Moldy nuts can cause severe neurological damage to your pet. In addition, certain nuts—like macadamia—are toxic to dogs even when fresh. Nuts offer little nutritional value to dogs, so there’s no reason to include them as a snack for your pet.
When you’re walking your dog, watch out for nut trees. Dogs enjoy eating fallen nuts, which are frequently moldy and extremely dangerous. Don’t allow your pet to graze off the ground in the vicinity of a nut tree.