Size and Build
Cairn Terriers are compact, sturdy dogs displaying a well-muscled frame with balanced proportions. Males and females typically stand between 23 to 33 cm tall at the withers, and weigh from 4.5 to 6.8 kg. Their body is low-set with well-sprung ribs, a level back, and supple loins, emphasising strength and agility suitable for their historic working role.
Coat and Colours
The breed’s distinctive double coat features a rough outer layer that is harsh but not coarse, providing strong weather resistance. The softer, short undercoat lies close to the skin. A slight wave in the coat is permissible and frequently observed. Colours are diverse and acceptable varieties include brindle, cream, dark and light wheaten, red, silver brindle, grey shades, and various brindle combinations. Often, markings appear darker on the muzzle and ears, and a Cairn’s coat colour can lighten or darken naturally over its lifetime, reflecting seasonal and age-related changes.
Distinctive Features
The head is small and broad with a well-defined stop and a powerful muzzle ending in a shiny black nose. Eyes are dark hazel, wide-set, and framed by shaggy eyebrows that enhance their expressive appearance. Ears are small, pointed, and pricked upright. The tail is short, well furnished, carried gaily but never curled over the back. Movement is free-flowing and lively, with balanced propulsion from hindquarters and reaching strides at the front.
Gender Differences
Males may be slightly larger and heavier than females but the size difference is subtle. Temperament-wise, males may display a marginally more assertive nature, whereas females are often considered equally spirited but sometimes more independent. These variances are individual rather than breed-defining.