Beagle Weight, Size & Lifespan
How big does a Beagle get?
A full-grown Beagle is a small dog, weighing about 20 lb as an adult.
- Adult weight
- 20 lb
- Also in kilograms
- 9 kg
- Size class
- Small
- Life expectancy
- 10–15 years
The American Kennel Club’s breed standard says “under 20 pounds (13 inches & under), 20-30 pounds (13-15 inches)” — not a range this page can chart.
Beagle Size
As a small breed, a Beagle reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).
Beagle Lifespan
How long do Beagles live?
The American Kennel Club publishes a life expectancy of 10–15 years for the Beagle, on its breed page. That is a figure for the breed, not a prediction for one dog — an individual Beagle can fall on either side of it.
A second source measured it instead of publishing it. McMillan et al. (2024) followed 4,678 dogs of this breed in the United Kingdom and recorded 1,552 deaths, giving a median age at death of 12.5 years (95% CI 12.3–12.7 years).
The two roughly agree here, which is not always the case: on 34 of the breeds on this site the measured median falls outside the range the AKC publishes, in both directions. They are still not the same measurement — a life expectancy for the breed on one side, the age half the studied dogs had died by on the other.
Beagle Growth Chart
What a Beagle 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 9.0 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 (4.4 kg) | 49% |
| 16 weeks | 11 lb (4.9 kg) | 54% |
| 18 weeks | 12 lb (5.2 kg) | 58% |
| 20 weeks | 12 lb (5.6 kg) | 62% |
| 24 weeks | 14 lb (6.2 kg) | 69% |
| 28 weeks | 15 lb (6.7 kg) | 75% |
| 32 weeks | 16 lb (7.2 kg) | 80% |
| 36 weeks | 17 lb (7.5 kg) | 84% |
| 40 weeks | 17 lb (7.9 kg) | 88% |
| 44 weeks | 18 lb (8.2 kg) | 91% |
| 48 weeks | 19 lb (8.5 kg) | 94% |
| 52 weeks | 19 lb (8.8 kg) | 97% |
Common questions
How much does a full-grown Beagle weigh?
A Beagle weighs about 20 lb (9 kg) as an adult. That figure is the mass Wikidata publishes for the breed under a CC0 license, re-checked here every week — it is a typical weight across many adult dogs, not a target for one dog.
Is a Beagle a small dog?
Yes — a Beagle counts as a small breed, going by its published adult weight (9 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 Beagle stop growing?
Earlier than a large dog. Hawthorne et al. (2004) measured that smaller breeds finish growing sooner, so a Beagle 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 one weight instead of a range?
Because that is what the source publishes for this breed — a single adult mass, not a span. Real Beagles still vary with sex, genetics, build and health, so read about 20 lb as the middle of a spread this source does not put numbers on. We don't invent the edges.
How long do Beagles live?
The American Kennel Club publishes a life expectancy of 10–15 years for the breed, re-checked here every week. That is a figure for the breed, not a prediction for one dog: an individual Beagle 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 4,678 dogs of this breed in the United Kingdom, recorded 1,552 deaths, and report a median age at death of 12.5 years (95% CI 12.3–12.7 years).
Breeds of a similar size
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Weight varies within the Beagle 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 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.