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Predation by coyotes (Canis latrans), domestic dogs, mountain lions (Felis concolor), black bears (Ursus americanus), red foxes (Vulpes vulpes), golden eagles (Aquila chrysaetos), and bobcats (Felis rufus) has been a major problem faced by domestic sheep, goat (NASS, 2000), and cattle (NASS, 2001) producers. Predators were reported to kill 273,000 sheep and lambs (NASS, 2000) and 147,000 cattle and calves (NASS, 2001) in the United States, and 61,000 goats in Arizona, New Mexico, and Texas (NASS, 2000) during either 1999 or 2000. Several methods, including the use of livestock guarding dogs, llamas, and donkeys, have been used to reduce these mortalities (Andelt, 1996, 2001). In this paper, I summarize use and effectiveness of livestock guarding animals for reducing predation on domestic sheep and goats. Recent reviews of livestock guarding animals are provided by Smith et al. (2000) and Rigg (2001).