Border Collies are among the most athletic, high-drive breeds, bred to herd tirelessly. They're usually lean — so weight gain in a Collie is often a sign of under-exercise or boredom as much as overfeeding.
Ideal weight
| Sex | Ideal range |
|---|---|
| Male | 14–20 kg (30–45 lb) |
| Female | 12–19 kg (27–42 lb) |
Weight is usually a symptom. A truly overweight Border Collie is less common than in most breeds — when it happens, it usually points to a dog not getting the intense physical and mental exercise it was bred for. Address the activity and the enrichment, not just the bowl; a bored Collie also finds trouble.
How to tell if your pet is overweight
- Feel for the ribs. Lay both hands flat on the ribcage; you should feel ribs easily under a thin layer without pressing.
- Look from above. There should be a clear waist tucking in behind the ribs; a straight or bulging outline means no waist.
- Check the side profile. The belly should tuck up behind the ribcage rather than hang level.
What to do about it
- Weigh the food, don't scoop it. Eyeballing portions is the most common cause of overfeeding.
- Count treats as calories — keep them under 10% of daily intake; swap biscuits for carrot or green bean.
- Give real exercise and a job. This breed needs both physical and mental work to stay lean and content.
- Reweigh monthly. Safe loss is about 1–2% of body weight per week; involve your vet for an overweight pet.
See exactly how overweight — and what that'd be on you
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Open the weight calculatorFrequently asked
How much should a Border Collie weigh?
Males 14–20 kg (30–45 lb), females 12–19 kg (27–42 lb).
Why is my active Collie gaining weight?
Often it signals too little exercise or mental stimulation for such a high-drive breed, alongside diet.
How much exercise does a Border Collie need?
A lot — vigorous daily activity plus mental work like training or herding games.