How Big Will My Leonberger Get?
Leonbergers are a giant breed that typically weigh 41–77 kg (90–170 lbs) at full size. Giant breeds are the slowest to mature, often not reaching their full adult weight until 18–24 months.
Leonberger Size at a Glance
Adult Weight
41–77 kg
90–170 lbs
Adult Height
65–80 cm
26–31 in
Size Category
giant
Fully Grown By
18–24 mo
Leonberger Growth Chart
Leonberger Weight by Age
Predict Your Leonberger Puppy's Adult Weight
Enter your puppy's current age and weight for a personalized prediction.
Open Weight CalculatorLeonberger 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 Leonberger's growth rate is fastest in the first 6 months of life. For larger breeds like the Leonberger, 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 Leonberger'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 Leonberger puppy get?
A full-grown Leonberger typically weighs between 41–77 kg (90–170 lbs). Males tend to be on the larger end of the range while females are usually smaller.
When do Leonbergers 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 Leonberger puppy weigh at 12 weeks?
At 12 weeks, a Leonberger puppy typically weighs around 17.7–23.6 kg (39–52 lbs), which is roughly 30–40% of their adult weight.
How can I tell if my Leonberger puppy is the right weight?
Compare your puppy's weight to the growth chart above. A healthy Leonberger puppy should follow a steady growth curve. If your puppy's weight deviates significantly from the expected range, consult your veterinarian.
Learn More About Leonbergers
Explore the full breed profile, find name ideas, or check ownership costs.