Collie Puppy Weight Calculator

Calculate the adult weight for your Collie. Just type your puppy’s current weight and age, and see how big your puppy gets.

Collie Growth Guide

Breed Overview

The Collie, known for its intelligence and elegance, originated in Scotland and Northern England, where it was developed as a herding dog for sheep. Popularized globally by the famous TV dog Lassie, the Collie is renowned for being loyal, affectionate, and gentle, making it a superb family companion. The breed exists in two coat types: Rough Collie (long coat) and Smooth Collie (short coat), both sharing the same overall structure and personality traits.

Classified as a large breed, adult Collies typically weigh between 50 and 75 pounds, depending on gender and genetics. Growth tracking is essential for Collies to avoid overfeeding during rapid growth phases, which can contribute to joint issues like hip dysplasia.

For more information on the Collie breed, see the American Kennel Club profile.

Collie Growth Chart & Weight Ranges

The table below provides general estimates for Rough and Smooth Collie puppy weight by age. These numbers can vary depending on genetics and nutrition.

Age	Average Weight Range
4 weeks	5–8 lbs
8 weeks	12–18 lbs
3 months	20–28 lbs
4 months	26–34 lbs
6 months	40–50 lbs
9 months	50–60 lbs
12 months	55–70 lbs (adult size)

Males generally weigh 10–15 lbs more than females and often grow slightly taller and more muscular.

How Much Bigger Will My Collie Puppy Get?

Most Collie puppies will reach approximately 50% of their adult weight by 4 to 5 months of age. They typically continue to gain weight steadily until about 12–15 months, with final muscle and coat development continuing into the second year.

Rule of Thumb:
To estimate your Collie’s adult size, double their weight at 16 weeks. For instance, if your puppy weighs 25 lbs at 4 months, they may grow to about 50 lbs.

Large breeds like the Collie usually complete most of their height growth by 9–12 months, but they may continue filling out and maturing up to 18–24 months.

Collie Growth Tips

Nutrition

Feed your Collie puppy a high-quality large-breed puppy food to support joint development and steady growth. Split meals into 3 portions a day until 6 months, then reduce to 2 meals daily. Avoid overfeeding during growth spurts to reduce the risk of skeletal issues.

Exercise

Collies are active and intelligent, but young puppies should not be overexercised. Opt for short walks and gentle play, gradually increasing activity with age. Avoid high-impact exercises like jumping or long-distance running for at least 12–15 months.

Health Watch

Growth-related concerns in Collies include:

• Hip dysplasia
• Collie Eye Anomaly (CEA) – a hereditary eye condition
• Bloat (gastric torsion) in adults
• Overgrowth leading to joint strain

Regular vet checkups and early screening (especially for eye health) are crucial for a healthy development phase.