Australian Shepherd Puppy Weight Calculator

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

Australian Shepherd Breed Profile

Breed Overview

Despite the name, the Australian Shepherd was actually developed in the United States to herd livestock on ranches and farms. With roots tied to Basque shepherds and working dogs from Australia, the breed became known for its intelligence, agility, and herding instincts. Aussies are incredibly energetic, highly trainable, and thrive on having a job to do — whether it’s herding, agility, obedience, or simply being an active family companion.

The Australian Shepherd is a medium-sized breed, typically weighing between 40 and 65 pounds as an adult. Growth tracking is crucial for this breed to ensure proper bone and joint development and prevent overfeeding, which can lead to obesity and orthopedic issues later in life. Because Aussies grow rapidly in their first year, monitoring their weight ensures they stay within healthy ranges.

Learn more about the breed from the AKC Australian Shepherd page.

Australian Shepherd Growth Chart & Weight Ranges

The table below shows average weight estimates by age. Males generally weigh 5–10 lbs more than females and may be slightly taller.

Age	Average Male Weight	Average Female Weight
4 weeks	5 – 7 lbs	4 – 6 lbs
8 weeks	10 – 15 lbs	8 – 12 lbs
3 months	20 – 25 lbs	17 – 22 lbs
4 months	25 – 30 lbs	22 – 27 lbs
6 months	35 – 45 lbs	30 – 40 lbs
9 months	45 – 55 lbs	35 – 45 lbs
12 months	50 – 65 lbs	40 – 55 lbs

Most Australian Shepherds reach their full adult height by 12 months, but some may continue to fill out until 16–18 months of age.

How Much Bigger Will My Australian Shepherd Puppy Get?

Australian Shepherds are moderately fast growers with consistent development:

• By four months, most Australian puppies have reached approximately 50% of their adult weight.
• A simple rule of thumb: Double your puppy’s weight at 16 weeks for a rough estimate of adult size.
• Australians typically reach their adult height by 10–12 months but continue to build muscle until around 16–18 months.

While not a giant breed, their high energy levels mean that balanced growth is crucial to prevent joint strain or obesity.

Australian Shepherd Growth Tips

Nutrition

• Feed a high-quality puppy food for medium-sized breeds until approximately 12 months old.
• Offer 3 meals per day until 6 months, then switch to 2 meals daily.
• Avoid overfeeding or free feeding — Australian Shepherds are prone to weight gain if under-exercised.

Look for foods labeled “complete and balanced” by AAFCO, with appropriate protein and fat levels for active dogs.

Exercise

• Start with short, age-appropriate walks and gentle play.
• Avoid intense jumping or agility until after growth plates close (around 12–15 months).
• Mental stimulation is just as important — puzzle toys, obedience training, and basic herding games work well for this intelligent breed.

Health Watch

Australian Shepherds are generally healthy, but a few growth-related issues to monitor include:

• Hip dysplasia – more common in fast-growing or overweight pups.
• Elbow dysplasia and joint stiffness – ensure exercise is low-impact during early development.
• Eye conditions (including Collie Eye Anomaly) – not weight-related but common in the breed; schedule early eye screenings.