American Water Spaniel Weight, Size & Lifespan
How big does an American Water Spaniel get?
A full-grown American Water Spaniel is a medium dog, weighing about 25–45 lb as an adult.
- Adult weight
- 25–45 lb
- Also in kilograms
- 11.3–20.4 kg
- Size class
- Medium
- Life expectancy
- 10–14 years
American Water Spaniel Size
As a medium breed, an American Water Spaniel reaches its adult weight earlier than a large dog — smaller breeds finish growing sooner (Hawthorne et al., 2004).
American Water Spaniel Lifespan
How long do American Water Spaniels live?
The American Kennel Club publishes a life expectancy of 10–14 years for the American Water Spaniel, on its breed page. That is a figure for the breed, not a prediction for one dog — an individual American Water Spaniel can fall on either side of it.
American Water Spaniel Growth Chart
What an American Water 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 15.9 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 | 8 lb (3.5 kg) | 22% |
| 10 weeks | 11 lb (4.9 kg) | 31% |
| 12 weeks | 13 lb (6.1 kg) | 38% |
| 14 weeks | 16 lb (7.1 kg) | 45% |
| 16 weeks | 17 lb (7.9 kg) | 50% |
| 18 weeks | 19 lb (8.7 kg) | 55% |
| 20 weeks | 21 lb (9.3 kg) | 59% |
| 24 weeks | 23 lb (10.5 kg) | 66% |
| 28 weeks | 25 lb (11.5 kg) | 72% |
| 32 weeks | 27 lb (12.3 kg) | 78% |
| 36 weeks | 29 lb (13.1 kg) | 82% |
| 40 weeks | 30 lb (13.7 kg) | 86% |
| 44 weeks | 32 lb (14.3 kg) | 90% |
| 48 weeks | 33 lb (14.9 kg) | 94% |
| 52 weeks | 34 lb (15.4 kg) | 97% |
Common questions
How much does a full-grown American Water Spaniel weigh?
An American Water Spaniel weighs 25–45 lb (11.5–20.5 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.
Is an American Water Spaniel a medium dog?
Yes — an American Water Spaniel counts as a medium breed, going by the middle of its adult weight range (11.5–20.5 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 an American Water Spaniel stop growing?
Earlier than a large dog. Hawthorne et al. (2004) measured that smaller breeds finish growing sooner, so an American Water 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 25–45 lb down to a single number would look more precise while being less true.
How long do American Water Spaniels live?
The American Kennel Club publishes a life expectancy of 10–14 years for the breed, re-checked here every week. That is a figure for the breed, not a prediction for one dog: an individual American Water Spaniel can fall on either side of it, and how a dog is fed, exercised and cared for moves the odds.
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Weight varies within the American Water 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 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), 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.