Use this Newfoundland puppy weight calculator to predict how big your puppy will get. Newfoundlands are a giant working breed that keeps growing until around 18-24 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
Slows fast eaters, can aid digestion, holds 4 cups dry or wet food — sized for giant breeds.
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| Age | Weight |
|---|---|
| Birth | 2 to 5 lbs |
| 2 Months | 8 to 15 lbs |
| 3 Months | 15 to 30 lbs |
| 4 Months | 25 to 45 lbs |
| 5 Months | 35 to 60 lbs |
| 6 Months | 45 to 75 lbs |
| 7 Months | 55 to 90 lbs |
| 9 Months | 65 to 105 lbs |
| 10 Months | 75 to 120 lbs |
| 1 Year | 85 to 135 lbs |
| 1.5 Years | 95 to 150 lbs |
| 2 Years | 100 to 150 lbs |
Estimated from typical giant-breed growth curves and the Newfoundland's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
Newfoundlands carry a notably elevated risk of subvalvular aortic stenosis (SAS), a congenital heart defect that's serious enough in this breed that a specific genetic variant has been identified; severely affected dogs can die suddenly, often before age two, so cardiac screening by echocardiogram is strongly recommended. They're also prone to hip and elbow dysplasia, cystinuria (a hereditary condition causing bladder stones), and bloat.
A large-breed puppy formula through the growth period, with meals split to help reduce bloat risk given the breed's deep chest.
The thick, water-resistant double coat needs brushing several times a week, more during heavy seasonal shedding — a genuine grooming commitment for a breed this size.
Newfoundlands are gentle and trainable, but given their eventual giant size, early obedience training matters enormously. This is a breed that doesn't tolerate heat well due to its heavy coat, so exercise should be managed carefully in warm weather.
The Newfoundland was developed on the island of Newfoundland, Canada, likely descending from dogs brought by European fishermen and bred locally into a powerful water-rescue and working dog capable of hauling nets, lines, and even people from icy Atlantic water. The breed's massive size, webbed feet, and water-resistant double coat all reflect that original job.
Newfoundlands are famous for a gentle, sweet temperament often described as one of the most patient and trustworthy among giant breeds — genuinely bred for rescue work, not guarding or aggression.
