Many llamas make very effective guardians for sheep, cattle, alpacas, and other livestock. In Pennsylvania llamas protect livestock from coyotes and other predators. In areas with wolf or dog packs, mountain lions, or aggressive bears, llamas should be paired with guard dogs.
Some studies have shown that llamas not only protect, but lead a flock of sheep, and are very gentle with lambs. Geldings and females make the best guards. Intact males should not be used in this role and all llamas should be at least eighteen months old.