Guard dog
Livestock guard dogs also called livestock protection dogs are bred and designed for protecting livestock from predators. In most cases their ability to guard their herd is instinctive. The dog bonds with the herd from an early age. They are not usually used to herd or move a herd. Their only job is to guard the herd. Many shepherds seem to match the color of the guardian dog to that of their sheep. The theory is that it makes them less threatening to the sheep and harder to identify by predators. This may explain why so many Livestock protection dogs are white.