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Large breed

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Collie Growth Chart

Male adult weight60–75 lb27.2–34 kg
Female adult weight50–65 lb22.7–29.5 kg

Collies are graceful, intelligent herders with a striking coat. Adults typically weigh 50–75 lb, with males heavier than females. Most reach adult weight around 14–18 months; the full coat takes longer.

View weight chart (lb & kg)

Calculate Your Collie Puppy's Adult Weight

Enter your Collie puppy's age and current weight for an estimated adult weight range.

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Collie weight by age

Typical male and female puppy weight ranges by age, available in lb and kg. Individual puppies may vary.

Most Collie puppies approach adult weight around 18 months, although individuals may finish earlier or later.

Weight unit
Expected Collie puppy weight at key ages in lb or kg
AgeTypical male rangeTypical female range
2 months (8 weeks)7.4–19.1 lb3.4–8.7 kg6.2–16.5 lb2.8–7.5 kg
3 months (12 weeks)11.3–23.9 lb5.1–10.8 kg9.4–20.7 lb4.3–9.4 kg
4 months (16 weeks)14.8–28.2 lb6.7–12.8 kg12.3–24.4 lb5.6–11.1 kg
5 months (20 weeks)17.9–32.1 lb8.1–14.6 kg14.9–27.8 lb6.8–12.6 kg
6 months (24 weeks)20.9–35.9 lb9.5–16.3 kg17.5–31.1 lb7.9–14.1 kg
7 months (32 weeks)26.6–43 lb12.1–19.5 kg22.2–37.2 lb10.1–16.9 kg
9 months (40 weeks)31.9–49.6 lb14.5–22.5 kg26.6–43 lb12.1–19.5 kg
1 year (52 weeks)39.4–59 lb17.9–26.8 kg32.8–51.1 lb14.9–23.2 kg
18 months (78 weeks)54.3–75 lb24.6–34 kg45.3–65 lb20.5–29.5 kg
24 months (104 weeks)56.1–75 lb25.4–34 kg46.8–65 lb21.2–29.5 kg

These estimated ranges combine the breed's adult weights with a size-based growth curve. They are not measured breed-specific percentiles or health targets. Month labels are rounded approximations; use the week values for each row. How these weight ranges are calculated

Collie Growth Stages

Understanding the typical growth stages helps you know what to expect as your Collie puppy grows.

Neonatal

0–2 weeks

Puppies are born with eyes and ears closed, relying entirely on their mother. Rapid weight gain occurs during this period.

Socialization

3–12 weeks

Eyes and ears open. Puppies begin to explore, play, and learn social behaviors. This is a critical period for development.

Juvenile

3–8 months

Rapid growth continues. Puppies become more independent, start teething, and develop coordination.

Adolescent

8–14 months

Growth rate begins to slow. Puppies reach sexual maturity and may test boundaries. Muscle mass develops.

Young Adult

14–18 months

Growth is nearly complete. Your puppy is filling out and approaching adult proportions.

Adult

18+ months

Your puppy has reached their full adult size. Weight should remain relatively stable with proper nutrition.

Collie FAQ

How much will my Collie puppy weigh as an adult?

Most adult Collies typically weigh between 50 and 75 lb. Males often reach 60–75 lb, while females usually finish at 50–65 lb. Your puppy's age and current weight help narrow the estimate.

At what age is a Collie fully grown?

Collies usually reach adult weight between 14 and 18 months. The luxurious coat keeps maturing well after the body stops growing.

How accurate is a Collie puppy weight chart?

Charts reflect breed averages, not guarantees. Rough and Smooth varieties share the same size range, but individual puppies vary with parents and nutrition.

Do male and female Collies grow differently?

Males are larger with a fuller mane, often 10–15 lb heavier than females. Females tend to reach adult size slightly earlier.

How much should I feed my Collie puppy?

Feed measured meals of a quality puppy food and adjust by body condition under all that coat — feel the ribs rather than trusting your eyes. Ask your vet about portions as growth steadies.

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