Collie.

At one year old they are able to perform full duty herding sheep, cattle and other stock, attending them all day when necessary, keeping them together and where they belong and driving off all strange intruders. They learn to know their master's animals from others in a very short time, and a well-trained dog will gather them home and put each into its right stall. They have a dainty carriage and line style, profuse silky hair of various colors.

Source: Dogs Manual