Yes, you can add pimentos with olive for dogs. But you should make sure that pimentos are the only item stuffed in the olive. Here note that pimentos contain some of the ingredients which are considered safe for the dogs but in less amount, so if you overfeed them, then your dogs may suffer from some health issues. Mainly olive contains various extra snacks with pimentos like cheeses, garlic, oils, onion, and other salty additives that are not in the interest of the puppy good health.