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It's a common question, but in asking the question, an assumption is revealed. The assumption is that dogs are not supposed to eat grass. After all, no one asks why we humans eat chicken, corn on the cob, fish, or strawberries. The short answer is that dogs eat grass because it tastes good and it provides some nutrition. It is not a sign of worms, an upset stomach, or any kind of nutritional deficit.
That's the short answer.
These kinds of foods can give your dog gastroenteritis or pancreatitis. Gastroenteritis is the medical term for vomiting and diarrhea. Pancreatitis is especially dangerous. It occurs when the dog is trying to digest a very fatty meal. The pancreas produces enzymes to assist in the digestive process. With pancreatitis, the pancreas produces far too much; it gets inflamed and can even begin digesting itself. The symptoms are vomiting and diarrhea, usually bloody. The dog will become dehydrated and can die.