Leonberger Puppy Weight Calculator

Calculate the adult weight for your Leonberger. Just type your puppy’s current weight and age, and see how big your puppy gets.

Leonberger Breed Profile & Growth Guide

Breed Overview

The Leonberger is a majestic and powerful working dog developed in 19th-century Germany, named after the town of Leonberg. Originally bred to resemble a lion and serve as a companion to European royalty, the Leonberger is known for its calm temperament, loyalty, and impressive strength. These gentle giants make wonderful family dogs due to their affectionate nature and patience with children.

Despite their size, Leonbergers are remarkably agile and thrive when given purposeful activity. Their double coat is water-resistant, and their temperament is a balanced mix of watchful guardian and friendly companion.

Size Category: Giant
Leonbergers fall into the giant breed category. Adult males typically weigh 110–170 lbs, while females weigh 90–140 lbs. Growth tracking is essential for this breed to prevent overfeeding and reduce the risk of joint and skeletal issues, such as hip and elbow dysplasia, during their extended growth period.

For more breed information, visit the American Kennel Club’s Leonberger page.

Leonberger Growth Chart & Weight Ranges

Age	Male Weight (lbs)	Female Weight (lbs)
4 weeks	8 – 12	7 – 11
8 weeks	18 – 25	15 – 22
3 months	35 – 45	30 – 40
4 months	50 – 65	40 – 55
6 months	70 – 90	60 – 80
9 months	90 – 115	80 – 100
12 months	105 – 135	90 – 120
18 months	115 – 155	95 – 130
24 months	120 – 170	100 – 140

Note: Males generally weigh 15–30 lbs more than females and tend to be taller and broader.

How Much Bigger Will My Leonberger Puppy Get?

Leonbergers are slow to mature and have a prolonged growth phase compared to smaller breeds.

• 50% of adult weight by 4.5–5 months
• 75% by 9 months
• Full adult weight by 18–24 months

Rule of thumb:
Double your Leonberger puppy’s weight at 16 weeks to estimate their adult size.

Exception:
Giant breeds like the Leonberger may continue developing muscle and bone density until 2 years of age or more.

For extra resources, visit the Leonberger Club of America.

Leonberger Growth Tips

Nutrition

• Feeding Schedule: Offer 3–4 small meals per day until 6 months, then transition to 2 meals daily.
• Feed a large- or giant-breed puppy formula designed to support controlled, steady growth and joint development.
• Avoid high-calorie or calcium-rich diets that can accelerate growth too quickly and lead to orthopedic problems.

Exercise

• Provide moderate, low-impact exercise like leash walks and swimming. Avoid excessive running or jumping while bones are still forming.
• Mental stimulation (e.g., training sessions, puzzle feeders) is equally important for this intelligent breed.
• Limit stair climbing and rough play during growth phases to protect developing joints.

Health Watch

• Hip and elbow dysplasia are primary concerns. Use orthopedic bedding and avoid slick flooring during puppyhood.
• Bloat (gastric torsion) is a risk for deep-chested breeds—feed smaller meals and avoid exercise immediately before/after eating.
• Routine vet checkups and joint screenings help ensure developmental progress is healthy and on track.