How big does a Cairn Terrier get?

A full-grown Cairn Terrier is a small dog, weighing about 13–17 lb as an adult.

Adult weight: 13–17 lb
Also in kilograms: 6–7.5 kg
Size class: Small

As a small breed, a Cairn Terrier reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).

Compare every breed’s adult weight·Your dog’s age in human years

Weight varies within the Cairn Terrier by sex, genetics and health, and mixed-breed dogs fall between their parents. This is a typical range, not a guarantee.

Verified on July 22, 2026. Based on Wikidata — dog breed mass (property P2067) (Wikimedia Foundation, requête du 2026-07-22, licence CC0) and Body-Weight Changes during Growth in Puppies of Different Breeds (Hawthorne et al., Journal of Nutrition, 2004, vol. 134, p. 2027S). See the method.