As the name implies, it is a sheep dog, but is also used as a watch dog and general working dog. When herding, the Icelandic Sheepdogs were not mainly used to take the sheep from one point to another, but to prevent animals from straying. Additionally, the dogs were in charge of herding horses and other animals, as well. When herding failed, the dogs drove the animals by barking. Thus, they tend to bark when they want something, although this behaviour can be controlled by training.