The breeds · side by side
for a first small dog
Cairn Terrier or West Highland White Terrier.
Two Scottish terriers from the same rough ground. The coat work and the trainability band are where a first-time owner should look; both are terriers, and a terrier has opinions.
Every value below shows its source and how sure we are. Breed sets the odds; the parents set the dog. Nothing here is a prediction about one dog.
What the question turns on
Grooming load
3 of 5 · RKC: grooming more than once a week.
3 of 5 · RKC: grooming more than once a week.
Exercise need
RKC: exercise up to 1 hour per day (size small).
RKC: exercise up to 1 hour per day (size small).
Coat
AKC: hard and weather-resistant, double-coated; any color except white; a slight wave is permitted, silkiness or curliness is a fault. UKC: cream, wheaten, red, gray or nearly black, brindling acceptable. FCI 4: same colours; not solid black, white, or black and tan. AKC page: grooming frequency 2 of 5, shedding 2 of 5 (AKC bands). RKC: medium coat, sheds, groom more than once a week.
AKC: white double coat, plucked and trimmed; a hard straight coat with some wheaten tipping is preferred to a soft white coat; coat 'should reflect the breed's purpose and terrain in which they work'. UKC and FCI 85: white, harsh outer coat about 2 in / 5 cm free from curl. AKC page: grooming frequency 3 of 5, shedding 3 of 5 (AKC bands). RKC: medium coat, sheds, groom more than once a week.
Median lifespan
14 years (13.8 to 14.3)
13.4 years (13.3 to 13.5)
The rest, read the same way
Height at the shoulder
9.5 to 12.2 in
10 to 11 in
Weight
13 to 16.5 lb
15 to 20 lb
Shedding
Shedding 2 of 5 (AKC breed page trait score)
Shedding 3 of 5 (AKC breed page trait score)
Heat tolerance
3 of 5 · AKC: hard, weather-resistant double coat, profuse harsh outer coat and short soft close undercoat. UKC and FCI agree: double-coated, harsh but not coarse.
3 of 5 · AKC: white double coat, hard and weather-resistant, straight hard hair with a short soft undercoat, longer jacket hair about 1.5 to 2 in. FCI 85: double coat, harsh outer about 5 cm.
Exercise need
AKC page energy level 3 of 5 and mental stimulation needs 3 of 5 (AKC bands). RKC: up to 1 hour per day, suits a flat or apartment, small to medium garden.
AKC page energy level 4 of 5 and mental stimulation needs 4 of 5 (AKC bands). RKC: up to 1 hour per day; suits a flat or apartment. Wikipedia (editorial): energetic, high prey drive, about one hour a day.
Energy
3 of 5
4 of 5
Role
UKC history: developed in Scotland to hunt otter, fox and other vermin along the shoreline; a small working terrier, agile and alert. AKC standard: an active, game, hardy, small working terrier of the short-legged class. RKC: from the 17th century used in the Western Highlands and the Isle of Skye to keep down vermin that threatened game; lighter in build than the other Scottish terriers, a game, rugged and harsh-coated sporting terrier. FCI 4: Group 3, Section 2 small-sized terriers, without working trial.
AKC standard: originally bred to hunt in packs for badger and eradicate vermin in the rough terrain of the Scottish Highlands. UKC history: from the early vermin-catching dogs of Scotland, thought to have been part of the Cairn breed. RKC: developed from Cairn ancestry; the Malcolms of Poltalloch bred a white strain, asserting white dogs were easier to see when working on the moors. FCI 85: Group 3, Section 2 small-sized terriers, without working trial.
Primary game
UKC: otter, fox and other vermin along the shoreline. RKC: vermin that were a threat to game, in the Western Highlands and on Skye. Wikipedia (editorial): the name comes from cairns, where the terriers often flushed out vermin; the Kennel Club of the UK registered the breed separately in 1912.
AKC standard: badger and vermin. RKC (terrier group text): fox, badger, rat and otter above and below ground. Wikipedia (editorial): rodents on farms; the breed retains earthdog instincts (inquisitive, bark, dig); thick tail said, unconfirmed, to allow a Westie trapped in a hole to be pulled out.
Search pattern
RKC: they often worked in small packs, going into the cairns, the small outcrops of stones common on the highland moors, that gave the breed its name. Wikipedia: the name comes from cairns where the terriers flushed out vermin.
AKC standard: originally bred to hunt in packs. RKC: white was kept because the dogs were easier to see when working on the moors. UKC and FCI 85: tail 5 to 6 in (13 to 15 cm), never docked.
Field trial standard
Cairn Terrier is on the AKC Earthdog eligibility list (Recognized Breeds): dogs must be 6 months or older and AKC, PAL or FSS registered. FCI 4 classifies the breed 'without working trial'.
West Highland White Terrier is on the AKC Earthdog eligibility list (Recognized Breeds): dogs must be 6 months or older and AKC, PAL or FSS registered. FCI 85 classifies the breed 'without working trial'.
Hip dysplasia
8.4% · OFA current all-data, accessed Oct 8 2026: 227 evaluations; Normal 91.2%, Dysplastic 8.4% (Mild 7.9, Moderate 0.4, Severe 0.0); OFA rank 149.
12.8% · OFA current all-data, accessed Oct 8 2026: 984 evaluations; Normal 86.3%, Dysplastic 12.8% (Mild 11.3, Moderate 1.2, Severe 0.3); OFA rank 101.
Elbow dysplasia
Not recorded for this breed yet.
3.7% · OFA current all-data, accessed Oct 8 2026: 163 evaluations; Normal 96.3%, Abnormal 3.7%; OFA rank 100.
Most common disorders
Wikipedia (editorial) lists commonly reported hereditary conditions: bronchoesophageal fistula, cataracts, craniomandibular osteopathy (lion jaw), Krabbe disease (globoid cell leukodystrophy), Legg-Calve-Perthes disease, lens luxation, luxating patella, ocular melanosis, portosystemic shunt, progressive retinal atrophy, von Willebrand disease, hip dysplasia, atopic dermatitis.
Wikipedia (editorial): predisposed to abdominal hernias; puppies may be affected by craniomandibular osteopathy ('Westie jaw'), an autosomal recessive condition.
Aggression, as studied
Not recorded for this breed yet.
Duffy, Hsu and Serpell 2008 (C-BARQ): breed-club sample n 92 Westies; the paper reports they tended to be more aggressive than fearful toward unfamiliar dogs (its Fig 2B), and in the online sample they are named among the breeds particularly aggressive toward unfamiliar dogs. The paper's printed breed-mean table (Table 5) does not include this breed, and the figures are not tabulated as numbers, so no mean is recorded.
The selector
Which one, for your life?
A few minutes of honest answers: the birds, the ground, the water, the house, the week. The selector ranks both of these against what you said, explains every rank, and shows exactly where the one you came in wanting lands.
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