King Charles Spaniel Weight & Size
How big does a King Charles Spaniel get?
A full-grown King Charles Spaniel is a small dog, weighing about 8–14 lb as an adult.
- Adult weight
- 8–14 lb
- Also in kilograms
- 3.6–6.3 kg
- Size class
- Small
King Charles Spaniel Size
As a small breed, a King Charles Spaniel reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).
King Charles Spaniel Growth Chart
What a King Charles Spaniel 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 5.0 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 | 4 lb (1.6 kg) | 33% |
| 10 weeks | 5 lb (2.1 kg) | 41% |
| 12 weeks | 5 lb (2.4 kg) | 48% |
| 14 weeks | 6 lb (2.7 kg) | 54% |
| 16 weeks | 6 lb (2.9 kg) | 59% |
| 18 weeks | 7 lb (3.1 kg) | 63% |
| 20 weeks | 7 lb (3.3 kg) | 67% |
| 24 weeks | 8 lb (3.7 kg) | 74% |
| 28 weeks | 9 lb (3.9 kg) | 79% |
| 32 weeks | 9 lb (4.2 kg) | 84% |
| 36 weeks | 10 lb (4.4 kg) | 89% |
| 40 weeks | 10 lb (4.6 kg) | 93% |
| 44 weeks | 10 lb (4.8 kg) | 96% |
| 48 weeks | 11 lb (4.9 kg) | 99% |
| 52 weeks | 11 lb (5.1 kg) | 102% |
Common questions
How much does a full-grown King Charles Spaniel weigh?
A King Charles Spaniel weighs 8–14 lb (3.6–6.3 kg) as an adult. That range 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 King Charles Spaniel a small dog?
Yes — a King Charles Spaniel counts as a small breed, going by the middle of its adult weight range (3.6–6.3 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 King Charles Spaniel stop growing?
Earlier than a large dog. Hawthorne et al. (2004) measured that smaller breeds finish growing sooner, so a King Charles Spaniel 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 8–14 lb down to a single number would look more precise while being less true.
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Weight varies within the King Charles Spaniel 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), 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.