Scottish Terrier Weight, Size & Lifespan
How big does a Scottish Terrier get?
A full-grown Scottish Terrier is a small dog, weighing about 18–22 lb as an adult.
- Adult weight
- 18–22 lb
- Also in kilograms
- 8.2–10 kg
- Size class
- Small
- Life expectancy
- 12 years
Wikidata publishes 19–23 lb for this breed. The two sources don’t measure the same thing — see why.
Scottish Terrier Size
As a small breed, a Scottish Terrier reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).
Scottish Terrier Lifespan
How long do Scottish Terriers live?
The American Kennel Club publishes a life expectancy of 12 years for the Scottish Terrier, on its breed page. That is a figure for the breed, not a prediction for one dog — an individual Scottish Terrier can fall on either side of it.
A second source measured it instead of publishing it. McMillan et al. (2024) followed 1,747 dogs of this breed in the United Kingdom and recorded 869 deaths, giving a median age at death of 12.7 years (95% CI 12.5–12.9 years).
These are not the same measurement, so they are shown side by side rather than reconciled: a life expectancy published for the breed on one side, the age half the studied dogs had died by on the other.
Scottish Terrier Growth Chart
What a Scottish Terrier puppy weighs week by week, from the growth curve FEDIAF publishes (Nutritional Guidelines 2025, Table VII-8a) for a dog whose expected adult weight is 9.1 kg. It is an average, not a target, and it is only valid from 8 weeks to one year — FEDIAF notes that growth patterns show a certain individual variability. Read a row as the middle of a spread.
| Age | Weight | % of adult weight |
|---|---|---|
| 8 weeks | 6 lb (2.6 kg) | 28% |
| 10 weeks | 7 lb (3.3 kg) | 37% |
| 12 weeks | 9 lb (3.9 kg) | 43% |
| 14 weeks | 10 lb (4.5 kg) | 49% |
| 16 weeks | 11 lb (4.9 kg) | 54% |
| 18 weeks | 12 lb (5.3 kg) | 58% |
| 20 weeks | 12 lb (5.6 kg) | 62% |
| 24 weeks | 14 lb (6.3 kg) | 69% |
| 28 weeks | 15 lb (6.8 kg) | 75% |
| 32 weeks | 16 lb (7.2 kg) | 80% |
| 36 weeks | 17 lb (7.6 kg) | 84% |
| 40 weeks | 18 lb (8.0 kg) | 88% |
| 44 weeks | 18 lb (8.3 kg) | 91% |
| 48 weeks | 19 lb (8.6 kg) | 94% |
| 52 weeks | 19 lb (8.8 kg) | 97% |
Common questions
How much does a full-grown Scottish Terrier weigh?
A Scottish Terrier weighs 18–22 lb (8.5–10.5 kg) as an adult. That range is the weight the American Kennel Club publishes in the breed's official standard, re-checked here every week — it is a typical weight across many adult dogs, not a target for one dog. Wikidata publishes 19–23 lb for the same breed — a breed standard and a set of measurements don't answer the same question, so this page names both rather than picking one.
Is a Scottish Terrier a small dog?
Yes — a Scottish Terrier counts as a small breed, going by the middle of its adult weight range (8.5–10.5 kg). The cut-offs between small, medium, large and giant are a common veterinary convention rather than one official standard, so a breed near a boundary can be described either way elsewhere.
When does a Scottish Terrier stop growing?
Earlier than a large dog. Hawthorne et al. (2004) measured that smaller breeds finish growing sooner, so a Scottish Terrier reaches something close to its adult weight before a big breed would. We don't publish a month-by-month figure, because no source gives one breed by breed — and an invented number would be worse than none.
Why is there a range instead of one weight?
Because the source publishes a range. Within any breed, weight varies with sex, genetics, build and health, and a mixed-breed dog usually falls between its parents' breeds. Narrowing 18–22 lb down to a single number would look more precise while being less true.
How long do Scottish Terriers live?
The American Kennel Club publishes a life expectancy of 12 years for the breed, re-checked here every week. That is a figure for the breed, not a prediction for one dog: an individual Scottish Terrier can fall on either side of it, and how a dog is fed, exercised and cared for moves the odds. A second source measured it rather than publishing it: McMillan et al. (2024) followed 1,747 dogs of this breed in the United Kingdom, recorded 869 deaths, and report a median age at death of 12.7 years (95% CI 12.5–12.9 years).
Breeds of a similar size
Every dog calculator
- Dog Age Calculator — Your dog’s age in human years, the science-based way
- Puppy Weight Calculator — How big will your puppy get, by breed
- Dog Pregnancy Calculator — Your dog’s due date from her mating date
- Dog Calorie Calculator — How many calories your dog needs a day
- Dog Chocolate Toxicity Calculator — How much chocolate is dangerous for your dog, by weight
- Puppy Feeding Calculator — How much to feed a puppy, by weight and age
- Dog Benadryl Dosage Calculator — How much Benadryl you can give a dog, by weight
- Puppy Vaccination Schedule — Puppy shots by age, from the AAHA’s published guidelines
Weight varies within the Scottish Terrier by sex, genetics and health, and mixed-breed dogs fall between their parents. This is a typical range, not a guarantee.
Verified on . Based on Wikidata — dog breed mass (property P2067) (Wikimedia Foundation, query run 2026-07-22, CC0 license), Breed weights — official AKC breed standards (American Kennel Club, breed pages, accessed 2026-07-29), Breed life expectancy — AKC breed pages (American Kennel Club, breed pages, accessed 2026-08-10), Longevity of companion dog breeds: those at risk from early death — Supplementary Table S3 (McMillan et al., Scientific Reports (2024), 14:531, 584,734 UK dogs — Kaplan-Meier median survival for 155 breeds), Body-Weight Changes during Growth in Puppies of Different Breeds (Hawthorne et al., Journal of Nutrition, 2004, vol. 134, p. 2027S) and Nutritional Guidelines for Complete and Complementary Pet Food for Cats and Dogs (FEDIAF (European Pet Food Industry Federation), 2025 edition (growth curves Table VII-8a, growth energy VII-8b and VII-10)). See the method.