Newfoundland growth chart
The AKC standard gives 59 to 68 kg for males and 45.4 to 54.4 kg for females, and about 71.1 cm at the shoulder for males and about 66 cm for females. That places the Newfoundland in the very large size category, so its growth follows that curve, scaled to this breed’s own published weight rather than to a category average.
This breed is past the edge of our reference data. The growth standards cover adult weights up to 40 kg and the Newfoundland averages about 56.7 kg. The heaviest category curve is the closest available and is what you see below, but expect a real Newfoundland to keep growing later than the table suggests.
What the breed standard says
| Measure | Metric | As the source states it |
|---|---|---|
| Weight, male | 59 to 68 kg | 130-150 pounds (male), 100-120 pounds (female) |
| Weight, female | 45.4 to 54.4 kg | 130-150 pounds (male), 100-120 pounds (female) |
| Height, male | about 71.1 cm | 28 inches (average male), 26 inches (average female) |
| Height, female | about 66 cm | 28 inches (average male), 26 inches (average female) |
| Life expectancy | 9 to 10 years | 9-10 years |
| AKC popularity | Ranks 47 of 210 | AKC breed registration statistics |
Figures are from the AKC breed standard for the Newfoundland. Its pounds and inches are converted to metric above. We are not affiliated with or endorsed by the AKC.
Newfoundland weight by age
Percentages are the very large category curve. Weights are those percentages applied to this breed’s published adult range, so the middle column is a Newfoundland at the centre of its standard.
| Age | Percent grown | Expected weight | Range across the standard |
|---|---|---|---|
| 12 weeks (2.8 months) | 31% | 19.7 kg (43 lb) | 18.3 to 21.1 kg |
| 16 weeks (3.7 months) | 41% | 25.9 kg (57 lb) | 24 to 27.7 kg |
| 20 weeks (4.6 months) | 52% | 33.3 kg (73 lb) | 30.9 to 35.6 kg |
| 26 weeks (6.0 months) | 68% | 43.1 kg (95 lb) | 40 to 46.1 kg |
| 34 weeks (7.8 months) | 82% | 52.3 kg (115 lb) | 48.6 to 56 kg |
| 43 weeks (9.9 months) | 91% | 57.5 kg (127 lb) | 53.4 to 61.5 kg |
| 52 weeks (12.0 months) | 93% | 59 kg (130 lb) | 54.9 to 63.2 kg |
| 78 weeks (1.5 years) | 98% | 62.2 kg (137 lb) | 57.8 to 66.6 kg |
| 104 weeks (2.0 years) | 100% | 63.5 kg (140 lb) | 59 to 68 kg |
| Age | Percent grown | Expected weight | Range across the standard |
|---|---|---|---|
| 12 weeks | 32% | 16.1 kg (36 lb) | 14.7 to 17.6 kg |
| 16 weeks | 42% | 21 kg (46 lb) | 19.1 to 22.9 kg |
| 20 weeks | 53% | 26.6 kg (59 lb) | 24.2 to 29.1 kg |
| 26 weeks | 68% | 34 kg (75 lb) | 30.9 to 37.1 kg |
| 34 weeks | 82% | 40.7 kg (90 lb) | 37.1 to 44.4 kg |
| 43 weeks | 90% | 44.8 kg (99 lb) | 40.7 to 48.8 kg |
| 52 weeks | 93% | 46.4 kg (102 lb) | 42.2 to 50.6 kg |
| 78 weeks | 98% | 48.8 kg (108 lb) | 44.4 to 53.3 kg |
| 104 weeks | 100% | 49.9 kg (110 lb) | 45.4 to 54.4 kg |
When a Newfoundland finishes growing
- Half adult weight at around 5 months.
- 90% of adult weight at around 10 months.
- Essentially finished by around 24 months.
- Senior from about 6.5 years, following AAHA life stage guidance, which sets senior status by proportion of expected lifespan rather than a fixed birthday.
Height finishes before weight. A Newfoundland that has stopped getting taller will still be filling out through the chest and shoulders for months afterwards, which is why an apparently full-grown dog can carry on gaining.
Feeding a Newfoundland puppy
At six months a male at the middle of the standard weighs about 43.1 kg and needs roughly 2,355 kcal a day. A grown one at 63.5 kg needs about 3,149 kcal. Both come from Merck’s resting energy formula with the growth multiplier applied.
Large breed growth formula, and no calcium supplement. Puppies absorb calcium passively until around six months and cannot down-regulate when intake is high. AAFCO caps large breed growth formulas at about 4.5 g per 1,000 kcal, with concerns reported above roughly 3.6. Feed a complete large breed puppy food and leave the calcium alone.
Across a whole first year that adds up to a real number, and the puppy price calculator works it out month by month for this size of dog.
Work out actual portions with the feeding calculator above, or the daily figure alone with the calorie calculator for a puppy. Both need the energy density from your bag, because two foods of the same weight can differ by hundreds of calories.
How much to trust this chart
- The curve is the size category, not the breed. Salt et al. grouped dogs by adult bodyweight because that is what predicts growth. There is no Newfoundland dimension in the source data, and any page claiming a breed-specific curve from it is claiming more than it has.
- The weights are the breed, though. They are the category percentages applied to the AKC published range, so the table ends where this breed actually ends. Our guide to how breed growth charts are actually built works through what that does and does not buy you.
- This breed sits away from the middle of its category. The category median adult is 33.7 kg against this breed’s 63.5 kg, a factor of 0.53. The weights are scaled correctly, but the timing may run differently from the category average.
- Past the reference ceiling. The data stops at 40 kg of adult weight and this breed averages more, so the curve is being applied beyond what was measured.
- A breed standard is a target, not a census. Plenty of healthy dogs sit outside it. Steady progress along one line beats hitting any particular number.
- Mixes are a different question. If your puppy is part Newfoundland, the mixed breed puppy size calculator will do better than this page.
Frequently asked questions
How big will my Newfoundland get?
The AKC standard gives 59 to 68 kg for males and 45.4 to 54.4 kg for females. The source states it as 130-150 pounds (male), 100-120 pounds (female).
Height runs about 71.1 cm at the shoulder for males and about 66 cm for females.
Those are the breed standard, not a prediction for your dog. A Newfoundland at the top of the range and one at the bottom are both entirely normal, and the puppy adult weight calculator will narrow it down from your puppy's current weight.
When does a Newfoundland stop growing?
Around 24 months for practical purposes, with the curve passing 90% of adult weight at about 10 months.
That is the very large category curve rather than a measurement on this breed specifically. Bigger dogs finish later: filling out in the chest and shoulders carries on for months after height has stopped, so a dog that looks finished may still be gaining.
What should a Newfoundland puppy weigh at 6 months?
About 43.1 kg (95 lb) for a male at the middle of the breed standard, and about 34 kg (75 lb) for a female. That is 68% of adult weight.
The full table above gives the rest of the first two years. Treat the figures as the centre of a range, not a target: a puppy tracking steadily along its own line matters far more than hitting a number on a given week.
How much should a Newfoundland eat?
At six months, roughly 2,355 kcal a day, using the Merck resting energy formula with the growth multiplier. A grown one at 63.5 kg needs about 3,149 kcal.
Turn that into portions with the how much should I feed my puppy calculator, which needs the energy density printed on your bag, because two foods at the same weight can differ by hundreds of calories.
Does a Newfoundland puppy need large breed food?
It needs food formulated for large breed growth, yes, and the reason is calcium rather than protein. Puppies absorb calcium passively until around six months and cannot down-regulate when intake is high, so excess goes somewhere.
AAFCO caps large breed growth formulas at about 4.5 g of calcium per 1,000 kcal, with concerns reported above roughly 3.6. The practical rule is simple: feed a complete large breed puppy food and do not supplement it with calcium.
Is this chart specific to the Newfoundland?
Half of it is, and it is worth knowing which half. The percentages come from the very large size category in Salt et al. 2017, which has no breed dimension in it at all. Any breed in this category shares that curve.
The weights are this breed's, scaled to the AKC published adult range. That is a more modest claim than a breed-specific curve, and it is the one the data actually supports.
Why does the page say the reference does not cover a Newfoundland?
Because the growth data stops at 40 kg of adult bodyweight, and this breed averages about 56.7 kg. The heaviest category is the closest curve available, and that is what is drawn here.
Expect the real curve to run later than shown: the largest breeds keep growing well past the point where a large dog has finished. We would rather tell you the curve is being stretched than quietly stretch it.
Related calculators
References
Every figure on this page comes from one of these. Full details, including what each source is used for, are on our sources page.
- American Kennel Club. Official Breed Standards.
- Salt C, Morris PJ, German AJ, Wilson D, Lund EM, Cole TJ, Butterwick RF. Growth standard charts for monitoring bodyweight in dogs of different sizes. PLOS ONE. 2017;12(9):e0182064. doi:10.1371/journal.pone.0182064
- Merck Veterinary Manual. Nutritional Requirements of Small Animals. Management and Nutrition.
- American Animal Hospital Association. AAHA Canine Life Stage Guidelines.