Bolognese Weight, Size & Lifespan
How big does a Bolognese get?
A full-grown Bolognese is a small dog, weighing about 6–10 lb as an adult.
- Adult weight
- 6–10 lb
- Also in kilograms
- 2.7–4.5 kg
- Size class
- Small
- Life expectancy
- 12–14 years
Wikidata publishes 6–9 lb for this breed. The two sources don’t measure the same thing — see why.
Bolognese Size
As a small breed, a Bolognese reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).
Bolognese Lifespan
How long does a Bolognese live?
The American Kennel Club publishes a life expectancy of 12–14 years for the Bolognese, on its breed page. That is a figure for the breed, not a prediction for one dog — an individual Bolognese can fall on either side of it.
A second source measured it instead of publishing it. McMillan et al. (2024) followed 182 dogs of this breed in the United Kingdom and recorded 32 deaths, giving a median age at death of 14.9 years (95% CI from 14 years, with no upper bound published — too few deaths observed to compute one).
⚠️ The two do not agree, and the gap is not small: 12–14 years against 14.9 years. We show both rather than averaging them, because they are not measuring the same thing. The AKC figure is what the breed club publishes for the breed; the McMillan figure is the age half of the dogs in that study had died by. A median at death sits below a life expectancy almost by construction — and here it lands above the published range, which is worth knowing either way.
Bolognese Growth Chart
What a Bolognese 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 3.6 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 | 3 lb (1.2 kg) | 33% |
| 10 weeks | 3 lb (1.5 kg) | 41% |
| 12 weeks | 4 lb (1.7 kg) | 48% |
| 14 weeks | 4 lb (2.0 kg) | 54% |
| 16 weeks | 5 lb (2.1 kg) | 59% |
| 18 weeks | 5 lb (2.3 kg) | 63% |
| 20 weeks | 5 lb (2.4 kg) | 67% |
| 24 weeks | 6 lb (2.7 kg) | 74% |
| 28 weeks | 6 lb (2.9 kg) | 79% |
| 32 weeks | 7 lb (3.1 kg) | 84% |
| 36 weeks | 7 lb (3.2 kg) | 89% |
| 40 weeks | 7 lb (3.4 kg) | 93% |
| 44 weeks | 8 lb (3.5 kg) | 96% |
| 48 weeks | 8 lb (3.6 kg) | 99% |
| 52 weeks | 8 lb (3.7 kg) | 102% |
Common questions
How much does a full-grown Bolognese weigh?
A Bolognese weighs 6–10 lb (2.5–4 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 6–9 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 Bolognese a small dog?
Yes — a Bolognese counts as a small breed, going by the middle of its adult weight range (2.5–4 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 Bolognese stop growing?
Earlier than a large dog. Hawthorne et al. (2004) measured that smaller breeds finish growing sooner, so a Bolognese 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 6–10 lb down to a single number would look more precise while being less true.
How long does a Bolognese live?
The American Kennel Club publishes a life expectancy of 12–14 years for the breed, re-checked here every week. That is a figure for the breed, not a prediction for one dog: an individual Bolognese 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 182 dogs of this breed in the United Kingdom, recorded 32 deaths, and report a median age at death of 14.9 years (95% CI from 14 years, with no upper bound published — too few deaths observed to compute one). The two disagree here — 12–14 years against 14.9 years — and we show both rather than averaging them, because they are not measuring the same thing.
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Weight varies within the Bolognese 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.