How Big Do Border Collies Get? Vet-Reviewed Average Growth and Weight Chart

Border Collies are medium-sized dogs originating from the border between Scotland and England. They're known for their intelligence, agility, and energy, making them excellent working dogs.

On average, Border Collies typically reach their adult height by around 12–15 months of age, though they may continue filling out and gaining muscle until about 1.5 to 2 years old. Male Border Collies tend to be somewhat larger than females, standing at 19 to 22 inches tall and weighing 30 to 55 pounds. Females stand 18 to 21 inches tall and weigh 27 to 42 pounds.

These growth rates can vary between individual Border Collies. Their nutrition, exercise, and genetics can influence their growth and development. Keep reading to learn exactly how big Border Collies can get.

Border Collie Overview

The Border Collie is an intelligent and energetic breed, first bred to herd sheep. They are medium-sized dogs with a lean build and coats in various colors and patterns. Border Collies have high energy levels, a great work ethic, and an eagerness to please.

Border Collies are strongly associated with Old Hemp, a well-known herding dog from the late 19th century that greatly influenced the modern breed. Old Hemp had exceptional herding abilities and worked as a stud to breed other sheepdogs. Other herding breeds, such as the Bearded Collie, Kelpie, and Rough Collie, share historical working dog ancestry and similarities with Border Collies, though they are not confirmed direct ancestors of the breed.

As working dogs, Border Collies excel in agility, obedience, and herding trials. They thrive when given plenty of exercise and mental stimulation. So, they're best suited for active owners who can give them plenty of opportunities to play.

In terms of temperament, Border Collies are friendly and loyal to their owners but can act reserved or even aloof around strangers. They're good with children and other pets when socialized properly. Their strong herding instincts can make them prone to certain behaviors. That includes nipping, chasing, and herding, which can become problematic if ignored. Proper training and socialization are essential for raising a well-behaved Border Collie.

Border Collie Size and Growth Chart

This growth chart for Border Collies is an approximate guideline only, and there is no universally accepted veterinary growth chart with exact milestone ranges for the breed. Individual growth can vary substantially depending on genetics, nutrition, sex, and overall health.

Growth charts can be useful for new owners to track the growth of their Border Collie puppy and ensure they're developing at a healthy rate, but be mindful there may be variations. If you are in any doubt about your puppy’s development, speak to a veterinarian.

When Does a Border Collie Stop Growing?

Border Collies typically reach most of their adult height by around 12–15 months, but may continue filling out in weight and muscle beyond this period. Most Border Collies will stop growing in height by the time they reach their first birthday. In rare cases, they may grow a little more in height until they are around 15 months old.

Individual Border Collies may have slightly different growth rates. So, they may continue to gain muscle mass and fill out until they're almost 2 years old. But their height is usually fully developed when they're 12 to 15 months old.

Tracking your Border Collie's growth during its first year is crucial. Rapid or stunted growth can point to underlying health issues or nutritional deficiencies. Consult your vet if you have concerns about your Border Collie's growth.

Factors Affecting the Size of a Border Collie

Border Collies can grow up to 22 inches tall, but some individual dogs may be bigger or smaller than others. Malnutrition, health issues, and genetics can affect the growth and development of a Border Collie.

• Genetics: A Border Collie's size is largely determined by its genetics. The size of a puppy's parents and ancestors can say how big it's likely to grow.
• Nutrition: Proper nutrition is essential for a Border Collie's growth and development. Feeding your dog a balanced and nutritious diet can ensure they grow to their full potential. The diet must be appropriate for their age and activity level.
• Exercise: Regular exercise is important for a Border Collie's physical development. Puppies that get plenty of exercise during their growth period are likely to grow into strong and healthy adults.
• Health: Various health issues can affect a Border Collie's growth rate. That includes hormonal imbalances, malnutrition, or skeletal problems. Ensure your dog is up to date on its vaccinations, deworming, and vet checkups to identify issues affecting its growth.

Ideal Diet for Maintaining a Healthy Weight

The ideal diet for a Border Collie varies based on age, activity level, and body condition. Here are some general guidelines to help you create a balanced diet for your Border Collie:

• Choose a high-quality dog food that meets the AAFCO standards for complete nutrition. Look for food appropriate for your dog's age, size, and activity level.
• Measure your dog's food portions to avoid overfeeding. Make sure to research the appropriate amount for your dog's weight and activity level.
• Limit treats and table scraps. These can add up and contribute to excess weight gain.
• Give your dog access to fresh water at all times. Proper hydration is important for maintaining a healthy weight.
• Consider feeding your Border Collie several small meals throughout the day. This may help them regulate their appetite and may reduce overeating.
• Consult a vet to create the appropriate feeding plan if you're concerned about your Border Collie's weight.
• Choose good protein sources. For Border Collies, this includes meat, fish, and eggs. Meanwhile, healthy fish oil and flaxseed fats can help support their skin and coat. Fruits and vegetables in moderation are other good sources of vitamins and minerals for your Border Collie.

How to Measure Your Border Collie

Measuring your dog during its growth period is important to ensure they’re developing normally. It can also help you watch their health and prevent obesity.

If you have difficulty measuring your Border Collie, consult a vet for guidance.

Final Thoughts

Border Collies are a medium-sized breed known for their herding abilities and athleticism. Like all dogs, they go through a growth period during the first year with major changes in height and weight. Owners can use an approximate growth chart to ensure their dog is growing at a healthy rate.

Factors like genetics, nutrition, and sex affect the size of a Border Collie. So, you mustprovide a balanced diet, regular exercise, and adequate mental stimulation.

Understanding how big Border Collies get and what factors affect their size is important for anyone wanting to own this breed. With proper care and attention, you can help them reach their full potential.

• See Also: Are Border Collies Hypoallergenic? Breed & Allergy Facts Explained

Featured Image Credit: Julia Suhareva, Shutterstock