Jacairn

The Cairn Terrier is a small but sturdy working terrier that stands approximately 9.5 to 10 inches tall at the shoulder, with females typically measuring at the lower end and males at the higher end of this range. Weight is proportionate to height, with females averaging around 13 pounds and males approximately 14 pounds. This compact breed presents a body that is slightly longer than it is tall, giving them the low-to-ground profile that made them effective at navigating rocky Scottish terrain in pursuit of vermin. The overall impression is one of strength and activity without any suggestion of heaviness or clumsiness. The head of the Cairn Terrier features a broad skull with a definite stop and a strong, short muzzle that is neither pointed nor excessively broad. Small, erect ears are set wide apart on the outer edges of the skull, contributing to the alert, foxy expression that characterizes the breed. The eyes are hazel in color, medium-sized, and set wide apart with shaggy eyebrows that give the face a somewhat impish appearance. The nose is black, and the teeth meet in a scissors or level bite. The neck is well-muscled and of moderate length, blending smoothly into well-laid shoulders that allow for the free movement essential in a working terrier. The Cairn Terrier's weather-resistant double coat is a defining characteristic of the breed. The outer coat is harsh, profuse, and somewhat shaggy in texture, while the undercoat is soft, short, and dense, providing insulation against the harsh Scottish climate. Coat colors include cream, wheaten, red, sandy, gray, and brindle in any of these colors, though pure white, solid black, and black and tan are not permitted by most kennel club standards. A notable characteristic is that brindled Cairns frequently change color throughout their lifetime, often becoming progressively darker or more silver as they age. The tail is short, well-furnished with hair but not feathered, and carried gaily but not curled over the back.

The Jack Russell Terrier is a compact, athletic working terrier that stands between 10 and 15 inches tall at the shoulder, with weight proportionate to height, typically ranging from 13 to 17 pounds. The breed standard emphasizes that the dog must be capable of going to ground, meaning it should be small and flexible enough to follow quarry into underground dens. The body is slightly longer than tall, presenting a balanced, square appearance when viewed from the side. The overall impression is one of a small but powerful dog built for endurance and agility rather than speed alone. The head of the Jack Russell Terrier is flat and moderately broad between the ears, tapering slightly toward the eyes. The muzzle is strong and powerful, slightly shorter than the length of the skull, with a well-defined stop. The nose is black, and the teeth meet in a scissors bite. The almond-shaped eyes are dark in color and express an intensity and intelligence characteristic of the breed. The ears are small, V-shaped, and carried in a button or drop position, falling forward close to the head. The neck is muscular and of good length, allowing the dog to maintain efficient movement while working. Jack Russell Terriers come in three coat types that are equally acceptable: smooth, which lies flat and close to the body; broken, which has some longer hair creating a slight roughness; and rough, which features longer wiry hair throughout. Regardless of type, the coat should be dense and weatherproof to protect the dog while working outdoors. The color must be predominantly white, comprising at least 51 percent of the coat, with markings of black, tan, or brown appearing mainly on the head and at the base of the tail. The tail is set high and traditionally was docked to approximately four inches, though docking is now optional in many countries. When alert, the tail is carried erect, signaling the terrier's characteristic confidence and readiness for action.