How Much Do Border Collies Typically Weigh?
From as early as one month old, both male and female Border Collies start with similar weight ranges. As they mature, males typically weigh more than females, reflecting natural growth patterns. By the time they reach one year, male Border Collies can weigh between 40 to 55 pounds, while females generally fall within the 30 to 50-pound range. These weights ensure that Border Collies maintain the agility and stamina they are celebrated for, especially given their high energy levels and need for regular exercise.
How Much Will An Adult Female Border Collie Weigh?
An adult female Border Collie typically weighs between 30 to 50 pounds. This range accounts for variations in genetics, diet, and activity levels. Maintaining a weight within this range helps prevent common health issues such as joint problems or obesity, which can hinder their agility and overall well-being.
How Large Will An Adult Male Border Collie Weigh?
An adult male Border Collie generally weighs between 40 to 55 pounds. This weight range supports their active lifestyle, enabling them to perform tasks that require endurance and strength, such as herding livestock or excelling in dog sports. Proper weight management within this range is crucial to prevent excessive weight gain, which can lead to health complications like hip dysplasia or cardiovascular issues.
Border Collie Weight & Size Chart
If you’d like to take a closer look at the expected sizes and weights of a typical Border Collie, we have a breakdown for you below.
Age | Typical Height | Typical Weight | ||
---|---|---|---|---|
Male | Female | Male | Female | |
1 Month | 8 to 10 inches | 8 to 10 inches | 6 to 10 pounds | 6 to 10 pounds |
3 Months | 14 to 16 inches | 13 to 16 inches | 15 to 20 pounds | 13 to 18 pounds |
6 Months | 18 to 20 inches | 17 to 19 inches | 28 to 40 pounds | 23 to 35 pounds |
9 Months | 19 to 22 inches | 18 to 21 inches | 36 to 50 pounds | 30 to 42 pounds |
1 Year | 19 to 22 inches | 18 to 21 inches | 40 to 55 pounds | 30 to 50 pounds |
- 1 Month: Both male and female Border Collies weigh between 6 to 10 pounds, establishing a strong foundation for their future growth, while typically standing around 8 to 10 inches in height.
- 3 Months: By the three-month mark, males generally increase their weight more rapidly, reaching 15 to 20 pounds, whereas females weigh between 13 to 18 pounds.
- 6 Months: At six months, male Border Collies weigh between 28 to 40 pounds and can reach up to 20 inches in height, while females typically weigh between 23 to 35 pounds and stand around 17 to 19 inches.
- 9 Months: Approaching nine months, males attain weights up to 50 pounds and heights up to 22 inches, compared to females reaching up to 42 pounds and 21 inches in height.
- 1 Year: By their first birthday, male Border Collies typically stabilize at 40 to 55 pounds and stand between 19 to 22 inches in height, whereas females maintain a slightly smaller weight range of 30 to 50 pounds and a stature of 18 to 21 inches.

Donald Gregory is a devoted Border Collie enthusiast with years of hands-on experience raising and caring for this intelligent, energetic breed. Through practical advice and personal insights, he helps fellow owners nurture happy, healthy, and well-adjusted Border Collies.