Border Collie Puppy Weight Calculator

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

Border Collie Breed Profile

Breed Overview

The Border Collie is one of the most intelligent and agile dog breeds in the world, originally developed on the border of England and Scotland for herding livestock. These dogs are known for their remarkable problem-solving abilities, tireless work ethic, and instinctive herding behavior. With sharp minds and quick reflexes, Border Collies excel in agility, obedience, and dog sports.

In the home, Border Collies are loyal, responsive, and affectionate, but they do best in active households that can provide mental and physical stimulation. Without enough engagement, they may become bored and develop unwanted behaviors. They’re ideal for experienced dog owners who appreciate a driven and energetic companion.

Size Category: Medium

Border Collies are classified as a medium breed, typically weighing 30–55 pounds and standing 18 to 22 inches tall at the shoulder. Their moderate size means they reach maturity earlier than large breeds, but growth tracking is still important to ensure proper development, especially during the first year when their skeletal and muscle systems are forming.

Border Collie Growth Chart & Weight Ranges

Below is a general growth chart for Border Collie puppies. These numbers can vary based on genetics, diet, and gender.

Age	Male Weight (lbs)	Female Weight (lbs)
4 weeks	3 – 5	2.5 – 4.5
8 weeks	6 – 10	5 – 9
3 months	10 – 15	8 – 14
4 months	14 – 20	12 – 18
6 months	20 – 30	18 – 27
9 months	25 – 38	22 – 34
12 months	28 – 45	25 – 40
18 months	30 – 55	27 – 45

Gender Differences:
Male Border Collies are typically 5–10 pounds heavier than females and may grow taller and more muscular, particularly as they mature beyond the one-year mark.

How Much Bigger Will My Border Collie Puppy Get?

Most Border Collie puppies reach 50% of their adult weight by 4 to 5 months of age. While they usually reach their full height by 12 months, they may continue to fill out and gain muscle mass until about 18 months.

Rule of Thumb

To estimate adult size:
Double your puppy’s weight at 16 weeks for a close approximation of their adult weight.

Example: A 15 lb puppy at 4 months may weigh around 30 lbs fully grown.

Note: Border Collies mature faster than giant breeds but slower than toy breeds, reaching full adult development between 12–18 months.

Border Collie Growth Tips

Nutrition

• Feeding Schedule: Feed 3–4 meals per day until 6 months, then reduce to 2 meals per day.
• Food Type: Choose a high-quality medium-breed puppy food that supports lean muscle development and joint health.
• Monitor Weight: Avoid overfeeding. Border Collies have lean builds and shouldn’t become overweight during growth.

Exercise

• Moderate Activity: Border Collie puppies need daily exercise—short walks, free play, and early training sessions.
• Mental Stimulation: Incorporate puzzle toys, basic obedience training, or scent games to keep their mind sharp.
• Avoid Overexertion: Puppies shouldn’t engage in high-impact activities (like jumping or long-distance running) until growth plates close around 12 months.

Health Watch

While generally healthy, Border Collies are prone to a few growth-related issues:

• Hip Dysplasia: Though less common than in larger breeds, it can occur. Keep exercising appropriately and maintain a healthy weight.
• Collie Eye Anomaly (CEA): A genetic eye condition—ask your breeder or vet about early screening.
• Osteochondritis Dissecans (OCD): A joint condition occasionally seen in active, fast-growing pups.