How Big Will My Border Collie Get?
Border Collies are a medium breed that typically weigh 14–20 kg (31–44 lbs) at full size. Medium breeds usually reach their adult weight around 12–14 months.
Border Collie Size at a Glance
Adult Weight
14–20 kg
31–44 lbs
Adult Height
46–56 cm
18–22 in
Size Category
medium
Fully Grown By
12–14 mo
Border Collie Growth Chart
Border Collie Weight by Age
Predict Your Border Collie Puppy's Adult Weight
Enter your puppy's current age and weight for a personalized prediction.
Open Weight CalculatorBorder Collie Growth & Development
Medium breeds usually reach their adult weight around 12–14 months. They have a steady growth curve with most growth happening in the first 6 months.
A Border Collie's growth rate is fastest in the first 6 months of life. During this period, proper nutrition and regular vet checkups ensure your puppy stays on a healthy growth trajectory.
Factors that influence your Border Collie's adult size include genetics (parent size), nutrition quality, spay/neuter timing, and overall health. Males typically weigh 10–20% more than females.
Frequently Asked Questions
How big will my Border Collie puppy get?
A full-grown Border Collie typically weighs between 14–20 kg (31–44 lbs). Males tend to be on the larger end of the range while females are usually smaller.
When do Border Collies stop growing?
Medium breeds usually reach their adult weight around 12–14 months. They have a steady growth curve with most growth happening in the first 6 months. Individual dogs may reach their full size slightly earlier or later depending on genetics, diet, and overall health.
How much should a Border Collie puppy weigh at 12 weeks?
At 12 weeks, a Border Collie puppy typically weighs around 5.1–6.8 kg (11–15 lbs), which is roughly 30–40% of their adult weight.
How can I tell if my Border Collie puppy is the right weight?
Compare your puppy's weight to the growth chart above. A healthy Border Collie puppy should follow a steady growth curve. If your puppy's weight deviates significantly from the expected range, consult your veterinarian.
Learn More About Border Collies
Explore the full breed profile, find name ideas, or check ownership costs.