Yes dogs can eat olives as long as the dog only eats olives in moderation.
Olives are very nutritious for dogs because olives contain lots of vitamins, minerals and other nutrients which all benefit your dogs health.
Just be aware that the olive pits could choke your dog especially if the dog is a smaller dog or puppy.
It's best to remove the olive pits before feeding your dog olives so that the dog does not get choked by the olive pits.
I feed my dog olives in moderation and remove the olive pits first so that the dog does not get choked.
Too many olives could cause diarrhea and possibly stomach pain in the dog.
But a little olives once in awhile is okay for your dog to eat.