A livestock guardian dog (LGD) is a dog type bred for the purpose of protecting livestock from predators.
A Maremma Sheepdog with a flock of sheep in Australia
Relief from a Roman sarcophagus depicting a herdsman and his dog, 2nd or 3rd century CE
A Great Pyrenees with a herd of goats
A "wolf-collar", commonly used as a neck-protection by LGDs against predators
A herding dog, also known as a stock dog or working dog, is a type of dog that either has been trained in herding livestock or belongs to one of the breeds that were developed for herding. A dog specifically trained to herd sheep is known as a sheep dog or shepherd dog.
An Australian Kelpie backing sheep.
A Koolie working with sheep.
Sheepdog transported with livestock in Fairlie, New Zealand
A nine-week-old Border Collie directing ducks.