Dog Weight Guide
How Much Should a Border Collie Weigh?
Complete weight guide for the Border Collie — from puppy to adult — with a growth chart, body condition tips, and health advice.
Ideal Adult Weight
12–20 kg
Medium breed · Origin: Scotland/England border
Border Collie Weight Chart by Age
Expected weight ranges at each growth stage. Individual dogs vary — use these as a guide, not a guarantee.
| Age | Expected Weight |
|---|---|
| 8 weeks | 2.2–3.6 kg |
| 3 months | 3.6–6 kg |
| 4 months | 5.4–9 kg |
| 6 months | 7.4–12.4 kg |
| 8 months | 9–15 kg |
| 12 months | 11.4–19 kg |
| 15 months (adult) | 12–20 kg |
* Approximate values. Females are typically 10–15% lighter than males.
Is My Border Collie a Healthy Weight?
⬇️ Underweight
- • Ribs, spine and hip bones clearly visible
- • No fat coverage
- • Prominent waist and tummy tuck
- • Low energy or coat issues
✅ Ideal Weight
- • Ribs felt easily, not visible
- • Waist visible from above
- • Slight abdominal tuck
- • Good muscle tone and energy
⬆️ Overweight
- • Ribs hard to feel under fat
- • No visible waist from above
- • Rounded, sagging belly
- • Reluctance to exercise
Keeping Your Border Collie at a Healthy Weight
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Feed the right amount
Adult Border Collies need 900–1300 kcal/day. Use our food calculator to dial in exact portions.
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Meet daily exercise needs
Border Collies need about 120 minutes of exercise per day. Regular activity is the most effective weight management tool.
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Limit treats
Treats should make up no more than 10% of daily calories. Use kibble or low-calorie treats for training.
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Weigh monthly
Weigh your dog at least once a month on the same scale. Early weight gain is much easier to address than established obesity.
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Annual vet check-ups
Your vet can spot weight changes you might miss and check for underlying conditions that cause weight gain.
Frequently Asked Questions
How much should a Border Collie weigh?
An adult Border Collie should weigh between 12 and 20 kg. Males are typically at the higher end of the range and females at the lower end.
When is a Border Collie fully grown?
Most Border Collies reach their full adult weight around 15 months.
Is my Border Collie overweight?
You should be able to feel your Border Collie's ribs without pressing hard, and see a visible waist when viewed from above. If neither is true, speak to your vet about a weight management plan.