What Age Do Border Collies Stop Growing?

Are you considering bringing a border collie into your life? As a border collie owner myself, I can tell you that these dogs are intelligent and loyal companions. But one question I often get asked is “What age do border collies stop growing?” In this article, I will provide an answer to that question and explain why it is important to know.

The first thing to understand is, like all breeds of dog, the growth of a border collie is determined by its genetics, environment, nutrition and health. On average, they will reach their full size when they are around 12-18 months old. This means that by the time they reach two years old they should be close to their full adult size.

What age do border collies stop growing

Meanwhile, physical maturity tends to come later than physical growth for most breeds of dog – including border collies. This means that while your pup may look adult-sized at two years old, their body may still be developing internally until around three to four years old.

So there you have it – a simple answer to the question “what age do border collies stop growing?” Knowing this information is important for any potential or current border collie owner as it affects decisions such as choosing the right size bed or crate for your pup! In the upcoming sections of this article we will take a closer look at how physical growth and maturity works in these amazing dogs.

Definition Of A Border Collie

A Border Collie is an incredibly loyal and intelligent breed of dog that’s been around for centuries. With a rich history, impressive characteristics, and an endearing personality, this breed has become one of the most popular canine companions in the world.

The Border Collie breed originated in the border area between England and Scotland in the 1800s. These dogs were bred to herd livestock and developed a reputation for being smart, reliable, and obedient workers. They have since evolved into a beloved family pet with an energetic personality that loves to play games.

Border Collies are known for their intelligence, so they require plenty of mental stimulation to stay happy. They need lots of exercise to stay fit both physically and mentally, but they also enjoy spending time just cuddling with their human companion. They tend to be quite sensitive and can even pick up on their owner’s moods, making them extremely empathetic pets. Their loving nature combined with their intelligence makes them a great addition to any home!

Physical Characteristics

Border collies are medium-sized dogs with a compact, agile body that is well suited for work. They have a double coat, consisting of a dense undercoat and a rough outer coat, which can come in many colors including black and white, red and white, or tricolor. The texture of their coat can range from smooth to wiry. They have an alert expression with a medium-length muzzle that tapers towards the nose and almond-shaped eyes. Their ears are triangular in shape and stand erect on the head. These dogs also have a long tail that is often curved towards the back when they are in motion.

No matter the color or texture of their fur, border collies always have an unmistakable look about them that sets them apart from other breeds. They are incredibly intelligent animals and make excellent working dogs, as well as loyal companions for active families.

At around two years old, most border collies will reach their full size and begin to slowly age until they reach 8-10 years old.

Developmental Stages

Border Collies are known as one of the most energetic breeds of dogs. They’re also incredibly intelligent and loyal. As a border collie owner, I can attest to their amazing qualities! But when do they stop growing? On average, border collies reach full physical maturity by two years old. This is when they enter adulthood and their growth rate slows down significantly.

During puppyhood, your border collie will grow very rapidly in terms of size and weight. Generally speaking, they’ll double their birth weight within the first month and triple it by three months old! As they move into the adolescent stage (six months to two years) their growth rate will slow down but they’ll still be gaining height and muscle mass.

By two years old, your border collie has likely reached full physical maturity. Their body proportions should now be as you’d expect for an adult border collie. However, mental maturity takes a little longer – usually up until four or five years old. During this time, your pup will continue to learn new tricks and become increasingly obedient with proper training and socialization.

As your border collie ages from adulthood into elderly age (seven years onwards), you may notice some changes in behavior or energy levels compared to when they were younger. With age comes wisdom – so make sure to keep an eye out for signs that your pooch needs more rest or fewer treats! It’s important to keep them healthy and active throughout their life so that they can stay happy and enjoy every stage of life with you!

Growth Plate Closure

The growth of your border collie is determined by the closure of the growth plates in the bones. Generally, a border collie will reach maturity between one and two years of age and their growth plates will begin to close.

Once these plates start to close, your pup’s growth rate will slow down significantly. This means that your puppy can still grow some until they reach two or three years old, but there won’t be any major changes in size after this point.

It’s important to understand that different border collies may mature at different times and at different rates depending on their genetics. It also depends on nutrition, exercise and overall health. However, most border collies tend to stop growing around two or three years old when their growth plates have closed completely.

By monitoring your pup’s development while they are growing you can get an idea of when they might stop growing. Knowing when your pup has stopped growing can help you make sure they get the right nutrition and exercise for their age and size so they can stay healthy and happy!

Factors Influencing Growth

When it comes to the growth of a border collie, there are many factors at play. From food intake to exercise levels, genetics to environment, and even breed type, each can affect a pup’s growth rate in one way or another.

Food Intake: As with all dogs, proper nutrition is key for healthy growth and development in border collies. A balanced diet rich in protein and vitamins will ensure they get adequate nourishment while growing.

Exercise Levels: Regular exercise is important for any pup, but especially so for border collies given their energy levels and need for activity. Taking them on walks or runs every day helps keep their bones strong and muscles toned during their growth period.

Genetics & Environment: Genetics play an important role in determining how fast a border collie grows, as well as its overall size when fully grown. Also, the environment the pup lives in can have an effect on its growth rate – from temperature to humidity levels – which can impact how quickly they reach maturity.

  • Breed Type:
  • Working Dogs: Working-type border collies usually stop growing around 18-24 months of age due to their larger size and heavier bone structure.
  • Show Dogs: Show-type border collies tend to reach full maturity earlier than working-types do – typically around 12-15 months of age – thanks to their lighter bone structure and smaller size.

No matter the type of border collie you have, it’s important to provide them with a healthy diet and plenty of exercise throughout their life if you want them to achieve optimal growth rates. This will ensure that your pup stays healthy throughout its entire life!

Health Considerations

The health of my border collie is an important consideration. They can be predisposed to certain illnesses and conditions, such as hip dysplasia, eye diseases, joint issues, bladder issues, and skin allergies. It’s best to take your pup for regular check-ups with the vet to ensure they stay healthy throughout their life.

It’s also important to make sure your border collie gets enough exercise. This breed loves running around and playing, so make sure you provide plenty of opportunities for them to stretch their legs and explore the world! Regular walks and trips to the dog park are great ways to keep them active. Additionally, providing a varied diet with healthy snacks will help ensure your pup stays in good shape.

Overall, taking care of a border collie is not too difficult but it does require some effort on your part! With regular vet visits, exercise, and proper nutrition you can do your part in keeping your pup happy and healthy into adulthood.


As an owner of a border collie, I can attest to the fact that they are a joy to have around. They are highly intelligent and loyal, making them great companions and family pets. Watching my pup grow has been one of the most rewarding experiences of my life. It’s incredible to see how quickly they develop during their puppy stage and then continue to grow and mature into adulthood.

Now that he’s reached maturity, I’m curious about when he’ll stop growing. Border Collies typically reach their full adult size at around 18 months old when their growth plates close. A few factors can influence their growth rate but overall it is determined by genetics and nutrition. Keeping him healthy with regular checkups, exercise, and proper nutrition will help ensure he reaches his full potential in size and maturity.

It’s been so much fun watching him grow up into the amazing dog he is today! Knowing when he’ll stop growing gives me peace of mind that I’m doing everything I can to give him the best life possible for as long as possible.

Categorized as Behaviour

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