The Border Collie is a well balanced, medium-sized dog of athletic appearance, displaying style and agility in equal measure with soundness and strength. Its hard, muscular body conveys the impression of effortless movement and endless endurance. 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.
Expression is intelligent, alert, eager, and full of interest. Eyes are set well apart, of moderate size, oval in shape. The color encompasses the full range of brown eyes, dogs having body colors other than black may have noticeably lighter eye color. Blue eyes (with one, both or part of one or both eyes being blue) in dogs other than merle, are acceptable but not preferred. Eye rims should be fully pigmented, lack thereof considered a fault according to degree. Ears are of medium size, set well apart, one or both carried erect and/or semi-erect (varying from one-quarter to three-quarters of the ear erect). When semi-erect, the tips may fall forward or outward to the side. Ears are sensitive and mobile.
Neck is of proportional length to the body, strong and muscular, slightly arched and blending smoothly into the shoulders. Topline - Back is level from behind the withers to the slightly arched, muscular loins, falling to a gently sloping croup. Body is athletic in appearance with a deep, moderately broad chest reaching no further than the point of the elbow. The rib cage is moderately long with well sprung ribs. Loins moderately deep and short, muscular, slightly arched and with a slight but distinct tuck up.
Forelegs should be parallel when viewed from front, pasterns slightly sloping when viewed from side. Because sufficient length of leg is crucial for the type of work the breed is required to do, the distance from the wither to the elbow is slightly less than from the elbow to the ground and legs that are too short in proportion to the rest of the body are a serious fault. The shoulder blades are long, well laid back and well-angulated to the upper arm. Shoulder blades and upper arms are equal in length. There is sufficient width between the tops of the shoulder blades to allow for the characteristic crouch when approaching and moving stock. The elbows are neither in nor out. Feet are compact, oval in shape; pads deep and strong, toes moderately arched and close together with strong nails of moderate length. Dewclaws may be removed.
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 variety is medium in length without being excessive. Forelegs, haunches, chest and underside are feathered and the coat on face, ears, feet, fronts of legs is short and smooth. The smooth variety is short over entire body, is usually coarser in texture than the rough variety and may have slight feathering on forelegs, haunches, chest and ruff. Neither coat type is preferred over the other. Seasonal shedding is normal and should not be penalized. The Border Collie's purpose as an actively working herding dog shall be clearly evident in its presentation.
Broad and muscular, in profile sloping gracefully to the low set tail. The thighs are long, broad, deep and muscular. Stifles are well turned with strong hocks that may be either parallel or very slightly turned in. Dewclaws should be removed. Feet, although slightly smaller, are the same as front.