The Australian Shepherd, or “Aussie,” is a lively and intelligent breed beloved by farmers, ranchers, and active pet owners. Known for their agility, high energy, and loyalty, these dogs make exceptional companions for those who can keep up with their activity levels. If you’re raising an Australian Shepherd puppy, you’re probably wondering how big your dog will get and what to expect as they grow.
This guide covers everything you need to know about the growth stages of both Standard and Mini Australian Shepherds, so you can track your puppy’s development and ensure they’re on a healthy growth path.
Quick Overview: Australian Shepherd Fun Facts
Despite its name, the Australian Shepherd is not actually from Australia. This breed originated in Europe and found its true calling on ranches and rodeos in California. Known for their herding instincts, Aussies have a natural drive to work and are happiest when they have a job to do. They excel as farm helpers, service dogs, and even therapy animals.
Australian Shepherd Sizes: Standard vs. Miniature
| Breed Summary | Standard Australian Shepherd | Miniature Australian Shepherd |
| Height | 18 to 23 inches (46 to 59 cm) | 13 to 18 inches (33 to 46 cm) |
| Weight | 40 to 65 pounds (40 to 29 kg) | 20 to 40 pounds (9 to 18 kg) |
| Full Height | 16 months | 10 months |
Australian Shepherds come in two primary sizes: Standard and Miniature. While Standard Aussies are medium-sized dogs, Mini Aussies offer a smaller version of the breed for those who may want a more compact companion.
Standard Australian Shepherd Size
- Height: 18-23 inches (46-59 cm)
- Weight: 40-65 pounds (40-29 kg)
Males tend to be about 15 pounds (7 kg) heavier and up to 2 inches (5 cm) taller than females.
Miniature Australian Shepherd Size
- Height: 13-18 inches (33 – 46 cm)
- Weight: 20-40 pounds (9-18 kg)
Mini Aussies are smaller but still maintain the same energy and intelligence as Standard Aussies. They reach their adult height by around 10 months, whereas Standard Aussies take up to 16 months to mature.
When Do Australian Shepherds Stop Growing?
Australian Shepherds generally reach their full height at around one year, but they may continue to fill out and gain muscle until they are about 16 months old. After this period, their growth rate slows, though their chest may broaden, and their coat will become fuller as they mature. By about two and a half years, your Australian Shepherd should have reached their full physical maturity.
Australian Shepherd Growth Chart
Tracking your Aussie’s weight and height can help ensure they’re growing at a healthy rate. Here’s a general growth chart for Australian Shepherds, separated by gender to account for size differences between males and females.
Female Australian Shepherd Growth Chart
| Age | Average Weight (lbs) | Average Weight (kg) |
| 1 month | 2-4 | 1-1.8 |
| 2 months | 5-10 | 2.3-4.5 |
| 3 months | 15-20 | 7-9 |
| 4 months | 20-25 | 9-11.3 |
| 6 months | 30-35 | 13.6-15.8 |
| 1 year | 40-50 | 18-22.6 |
| 2 years | 40-55 | 18-25 |
Male Australian Shepherd Growth Chart
| Age | Average Weight (lbs) | Average Weight (kg) |
| 1 month | 3-5 | 1.4-2.3 |
| 2 months | 10-15 | 4.5-7 |
| 3 months | 20-25 | 9-11.3 |
| 5 months | 34-39 | 15.4-17.6 |
| 6 months | 40-46 | 18-20.8 |
| 1 year | 50-60 | 22.6-27 |
| 2 years | 50-65 | 22.6-29.4 |
Note: These numbers are general averages. Your Aussie’s weight may vary slightly, and small differences are usually no cause for concern.
Growth Stages: From Puppy to Adult Australian Shepherd
Understanding each growth stage can help you provide the appropriate care for your Aussie as they develop.
0-4 Weeks: Newborn Stage
During the first few weeks, Australian Shepherd puppies rely entirely on their mother for nourishment and warmth. They grow rapidly in this stage, typically doubling their birth weight within the first two weeks.
4 Weeks: Weaning Begins
At around one month old, Aussie puppies start to wean and are introduced to solid foods. Their eyes and ears open fully, and they begin socializing with littermates, which is essential for their development.
8 Weeks: Ready to Go Home
By eight weeks, most Australian Shepherd puppies are ready to join their new families. At this stage, they are fully weaned, have their baby teeth, and are eager to explore.
3-4 Months: Socialization and Training
Between three and four months, Australian Shepherds are in a critical socialization period. Exposing them to various environments, people, and other pets helps develop a well-rounded personality. Basic training should also begin during this time.
6 Months: Adolescence
Around six months, Aussies are entering their “teenage” phase. This period can bring some independence and testing of boundaries, so consistent training is crucial. They’ll also have developed most of their adult coat and reached two-thirds of their adult weight. Discovering Australian Shepherd Colors can also be exciting as their coat fully develops.
1 Year: Nearly Fully Grown
By one year, most Aussies have reached their adult height, though they may continue to fill out and gain muscle for a few more months. Their energy levels remain high, so regular exercise is essential.
Factors That Affect Australian Shepherd Growth
Several factors can influence how big your Australian Shepherd will get and how they develop as they grow.
- Genetics
Genetics play the largest role in determining your Aussie’s adult size. If you bought your puppy from a breeder, they can give you a good estimate based on the size of the parents and previous litters. - Neutering/Spaying
Early spaying or neutering can affect growth. Studies suggest that dogs neutered or spayed before maturity may grow slightly taller, as the procedure affects hormone levels that regulate growth plate closure. - Diet and Nutrition
Providing a balanced, high-quality diet is essential for your Aussie’s growth. Puppies need a formula specifically designed for their life stage to ensure they receive all the necessary nutrients. For guidance on their diet, refer to the Best Dog Food for Australian Shepherd. - Physical Activity
Australian Shepherds are high-energy dogs and require daily exercise. However, be cautious not to over-exercise puppies, as their developing bones and joints are still sensitive. Moderate, age-appropriate exercise is best until they reach full maturity.
Ensuring a Healthy Growth Journey for Your Australian Shepherd
To support your Australian Shepherd’s health and growth, routine vet visits and a proactive approach to care are key.
- Regular Vet Checkups
Preventative care can catch potential health issues early, ensuring your Aussie stays on track. Regular checkups also allow your vet to monitor your dog’s weight and overall health. - Proper Diet
Aussies benefit from a high-quality diet rich in protein and essential nutrients. Avoid overfeeding, as obesity can strain your dog’s joints, leading to long-term issues, especially during growth. - Moderate Exercise
While exercise is vital for Australian Shepherds, avoid rigorous activities with young puppies. Encourage playtime and gentle exercise, like short walks or interactive toys, to keep them active without overstressing their developing bones. - Socialization and Training
Socialization is essential for Australian Shepherds. These intelligent dogs need mental stimulation as much as physical activity, so introduce them to new environments, people, and other animals to nurture a well-adjusted personality. Learning about Australian Shepherd Price can also inform your decisions on adoption or purchase.
Frequently Asked Questions (FAQs) about Australian Shepherd Growth
Can Australian Shepherds grow too fast?
Yes, rapid weight gain can place stress on joints, leading to potential skeletal problems later in life. Stick to a balanced diet and avoid overfeeding to help your dog grow at a healthy rate.
How can I weigh my dog at home?
If you don’t have a pet scale, try weighing yourself, then weigh yourself again while holding your dog. Subtract your weight from the combined weight to get your dog’s approximate weight.
Why is my Aussie smaller than average?
Not all Australian Shepherds grow at the same rate. Genetics, nutrition, and activity level can all play a role. If you’re concerned about their size, consult your veterinarian to rule out any health issues.
Are Australian Shepherds bigger than Miniature American Shepherds?
Yes, Standard Australian Shepherds are larger. Miniature American Shepherds, often mistaken for mini Aussies, are a separate breed weighing between 20-40 pounds and standing 13-18 inches tall.
Conclusion: How Big Will Your Australian Shepherd Get?
Now that you have a clearer understanding of how your Australian Shepherd will grow, you can better anticipate and support their development. While the growth rate and size can vary slightly, most Aussies reach their full adult height by one year and their full weight by about 16 months. With proper care, nutrition, and exercise, your Australian Shepherd will grow into a strong, healthy, and loyal companion.
Looking for more insights about Australian Shepherds? Check out these helpful resources:
- Australian Shepherd Names for inspiration on naming your pup.
- Australian Shepherd Mixes to explore unique mixed breeds.
- Border Collie vs. Australian Shepherd to compare these popular herding dogs.
How big is your Australian Shepherd? Share your experiences with us in the comments below!
Would you like any additional insights on caring for Australian Shepherds, or perhaps tips on training? Let me know!