are border collies double coated
There is also a smooth-coated variety; some breed organisations, including both the American and the Canadian Kennel Clubs, consider the smooth-coat and rough-coat dogs to be variations of the same breed. Rough Collies generally come in shades of sable, merles, and tri-coloured. Once seen, the contrast between the Rough Collie head and that of a Border Collie is immediately apparent, the latter having a considerably shorter muzzle and a more distinct stop between muzzle and forehead. The ruff is also distinctive in distinguishing the two breeds. Coat Two varieties are permissible, both having close-fitting, dense, weather resistant double coats with the top coat either straight or wavy and coarser in texture than the undercoat which is soft, short and dense. The Rough Collie (also known as the Long-Haired Collie) is a long coated breed of medium to large size dog that in its original form was a type of collie used and bred for herding in Scotland. The Border Collie is extremely intelligent, with its keen, alert expression being a very important characteristic of the breed. Any aspect of structure or temperament that would impede the dog's ability to function as a herding dog should be severely faulted. The Border Collie is, and should remain, a natural and unspoiled true working sheep dog whose conformation is described herein. Honorable scars and broken teeth incurred in the line of duty are acceptable. Head Expression is intelligent, alert, eager, and full of interest. The Border Collie requires weekly brushing. Special attention should be given to the coat during shedding. Bathing or dry shampooing should only be done when necessary. This breed is prone to PRA, hip dysplasia, epilepsy, deafness, Collie Eye Anomaly, and allergies to fleas. The Border Collie needs regular combing and brushing to keep the coat gleaming. Extra care is needed when the soft, dense undercoat is shedding. Bathe or dry shampoo only when necessary. Check the ears and coat regularly for ticks. The Border Collie comes in two coat varieties: rough or smooth. Both varieties are double coat and weather resistant and are close fitting and thick. The outer coat is either wavy or straight and coarse in texture. The under coat is dense, short, and soft. The rough coat variety has fur of medium length. In the UK the Rough Collie is no longer used for serious herding, having been replaced by the Border Collie. Though in the United States and a number of European countries, there has been a resurgence in the use of the Collie as a working and performance dog. The smooth variety has fur of short length over the entire body and there may be slight feathering on the chest, ruff, haunches, and forelegs. The color of the coat comes in all colors or combination of colors and markings. They may be solid, merle, sable, bi-color, or tri-color. Border Collies are average shedders.
Yes,border collies  are double coated.