Border Collie Full Grown: Size & Weight
A full-grown Border Collie weighs about 30–55 lb and stands roughly 18–22 in tall at the shoulder.
Have a Border Collie puppy? Estimate its adult size
Built on the medium growth curve, clamped to the breed's range.
Border Collie growth chart
How a medium-size dog like the Border Collie fills out over its first months. Switch between percent of adult weight and pounds, and enter a weigh-in above to plot your puppy.
- Border Collie
- Your puppy
Median curves computed from ~89,000 healthy dogs aged 2–24 months in the open Salt et al. 2017 dataset (PLOS ONE, CC BY 4.0), grouped into PuppySize's five size classes.
- Border Collie · 30–55 lb
- Your puppy
Each shaded band shows the typical weight range at every age, with the line marking the middle of that range.
| Age | % of adult weight | Estimated weight |
|---|---|---|
| 2 months | 24.3% | 7–13 lb |
| 3 months | 38.6% | 12–21 lb |
| 4 months | 54.6% | 16–30 lb |
| 5 months | 67.4% | 20–37 lb |
| 6 months | 77.7% | 23–43 lb |
| 7 months | 83.1% | 25–46 lb |
| 8 months | 89.8% | 27–49 lb |
| 9 months | 92.3% | 28–51 lb |
| 10 months | 94.4% | 28–52 lb |
| 11 months | 97.1% | 29–53 lb |
| 12 months | 100% | 30–55 lb |
How confident is this estimate? Based on an official breed standard or cross-checked veterinary/registry sources.
About this breed's data: AKC standard: males 19-22 in, females 18-21 in; 30-55 lb.
Sources: American Kennel Club, Salt et al. 2017 (PLOS ONE) growth data.
Border Collie questions
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