Like other types of working dog, Welsh Sheepdogs are normally bred for their herding abilities rather than appearance, and so they are different in build, colour and size. Welsh Sheepdogs are the collie type, usually black-and-white, red-and-white or tricolour, and merle markings may occur over any of these combinations. The coat may be short or fairly long, and the ears are pricked, but usually folded at the tip. They are longer in leg, broader in chest and wider in muzzle than the Border Collie. They are extremely active and intelligent, and therefore need much exercise and mental stimulation, if they are to be kept as pets.