Every Leonberger grows at its own pace. Enter your puppy’s age and weight below to see where it sits on the breed’s growth curve and what adult size to expect.
Estimates combine your puppy’s current trajectory with typical growth curves for this breed and size class. Individual dogs vary — nutrition, genetics and neuter timing all matter. For health concerns, ask your vet.
The Leonberger is a giant breed. Adult males typically weigh 110–170 lb (49.9–77.1 kg) and females 90–140 lb (40.8–63.5 kg). Most Leonbergers reach about half their adult weight around 5.0 months, hit 90% by roughly 12.2 months, and are fully grown near 20 months. Giant breeds grow longer than any other dogs — some don’t reach full size until age two.
When do Leonbergers stop growing?
Most Leonbergers reach their full adult height and weight by about 20 months. Growth is fastest before 5.0 months, then slows steadily — by 12.2 months your puppy will be about 90% of its final size.
How much should a Leonberger puppy weigh at 4 months?
A typical 4-month-old Leonberger weighs roughly 41–63 lb, about 41% of its adult weight. Use the calculator above with your puppy’s exact weight for a personalized estimate — individual dogs vary.