Olives, in their natural state, are safe for dogs. A single olive should not pose a health risk to your dog. Pickled and canned olives, however, because of high levels of sodium just aren’t appropriate for dogs. Also, make sure the olives are pitted. Pits can be a choking hazard to your dog, so be careful and keep them away.
Consumption of any new and unfamiliar foods, including olives, may lead to digestive distress in dogs so be careful with the amount!