Use this Australian Shepherd puppy weight calculator to predict how big your puppy will get. Australian Shepherds are a herding breed that typically reaches full size by around 12-18 months.
Enter your puppy's current weight and age to predict their adult size
Estimates based on breed growth curves. Individual dogs vary with genetics and nutrition — check with your vet for a personalized read.
A practical pick for medium-sized breeds.
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| Age | Weight |
|---|---|
| Birth | 1 to 2 lbs |
| 2 Months | 6 to 13 lbs |
| 3 Months | 10 to 20 lbs |
| 4 Months | 14 to 26 lbs |
| 5 Months | 18 to 33 lbs |
| 6 Months | 22 to 39 lbs |
| 7 Months | 26 to 46 lbs |
| 9 Months | 30 to 52 lbs |
| 10 Months | 34 to 59 lbs |
| 1 Year | 38 to 64 lbs |
| 1.5 Years | 40 to 65 lbs |
| 2 Years | 40 to 65 lbs |
Estimated from typical medium-breed growth curves and the Australian Shepherd's adult weight range. Individual puppies vary — use the calculator above for a prediction based on your puppy's actual current weight.
New breed data, growth tips, and puppy-parenting insights, plus our free printable puppy growth tracker.
About half of Australian Shepherds carry the MDR1 gene mutation, which makes them dangerously sensitive to certain common medications (including some heartworm preventatives and anti-diarrheal drugs) — a simple DNA test identifies carriers, and results should be shared with your vet before any new medication. Aussies are also predisposed to hip dysplasia and hereditary eye conditions like cataracts and Collie Eye Anomaly. Note: double-merle-colored dogs (from two merle parents) are at higher risk of impaired hearing.
Match food to activity level — Aussies are a working breed and can be prone to weight gain if fed like a high-energy dog while living a low-energy lifestyle.
The medium-length double coat sheds moderately year-round with heavier seasonal blowouts; brushing 2-3 times a week keeps it manageable.
Aussies need real mental and physical work, not just a walk — herding instincts, obedience, or agility give them the outlet they're bred for. Without it, that intelligence turns into problem behavior.
Despite the name, the Australian Shepherd was developed in the western United States in the 1800s, likely from herding dogs that arrived with Basque shepherds who had passed through Australia en route to California. Aussies were prized on American ranches for their intelligence, stamina, and herding instinct.
The breed's defining trait is a strong desire to work — Aussies are high-energy, highly intelligent dogs bred to think independently while herding livestock, and that same drive needs a real outlet in a companion home.
