How Big Will My Newfoundland Get?
Newfoundlands are a giant breed that typically weigh 45–70 kg (99–154 lbs) at full size. Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months.
Newfoundland Size at a Glance
Adult Weight
45–70 kg
99–154 lbs
Adult Height
63–74 cm
25–29 in
Size Category
giant
Fully Grown By
18–24 mo
Newfoundland Growth Chart
Newfoundland Weight by Age
Predict Your Newfoundland Puppy's Adult Weight
Enter your puppy's current age and weight for a personalized prediction.
Open Weight CalculatorNewfoundland Growth & Development
Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months. They have an extended growth period that requires careful nutrition management.
A Newfoundland's growth rate is fastest in the first 6 months of life. For larger breeds like the Newfoundland, it's important not to over-feed during the growth phase, as rapid weight gain can put stress on developing joints and bones.
Factors that influence your Newfoundland's adult size include genetics (parent size), nutrition quality, spay/neuter timing, and overall health. Males typically weigh 10–20% more than females.
Frequently Asked Questions
How big will my Newfoundland puppy get?
A full-grown Newfoundland typically weighs between 45–70 kg (99–154 lbs). Males tend to be on the larger end of the range while females are usually smaller.
When do Newfoundlands stop growing?
Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months. They have an extended growth period that requires careful nutrition management. Individual dogs may reach their full size slightly earlier or later depending on genetics, diet, and overall health.
How much should a Newfoundland puppy weigh at 12 weeks?
At 12 weeks, a Newfoundland puppy typically weighs around 17.3–23 kg (38–51 lbs), which is roughly 30–40% of their adult weight.
How can I tell if my Newfoundland puppy is the right weight?
Compare your puppy's weight to the growth chart above. A healthy Newfoundland puppy should follow a steady growth curve. If your puppy's weight deviates significantly from the expected range, consult your veterinarian.
Learn More About Newfoundlands
Explore the full breed profile, find name ideas, or check ownership costs.