>Hog rings are used in the Pig industry to keep the pigs from doing what they naturally do and that’s rooting. Pigs love to root and will dig up a pasture or a pen pretty quickly. They will also dig under a fence and escape their pen at times as well. The use of pig rings prevents this activity by applying pressure to their snout when they root. https://www.whitemountainslivestock.com/why-do-pigs-have-nose-rings/