On average, it is recommended to serve two "pigs in a blanket" per person.  However, this can alter depending on the size of the blankets and the size of the appetites of those partaking in the meal.  Additionally, while traditionally, these savory snacks are served as an appetizer or snack food, they can also be served as a full course.  In that case, you may want to increase the amount of "pigs in a blanket" per person to four or five.