When is a Westie Full Grown?

When is a Westie Full Grown?

Westies, also known as West Highland White Terriers, typically reach their full-grown size and physical maturity between the ages of 12 to 18 months. However, it’s essential to understand that the timeline for reaching full maturity can vary slightly from one dog to another. Some Westies might reach their full size closer to 12 months, while others may take up to 18 months.

When is a Westie Full Grown?
When is a Westie Full Grown?

During this period of growth and development, it’s crucial to provide them with proper nutrition, regular exercise, and adequate healthcare to ensure they develop into healthy adult dogs. Once they have reached their full size, their physical appearance and characteristics will remain relatively stable throughout their adult life.

What Impacts the Size of a Westie?

The size of a West Highland White Terrier (Westie) can be influenced by several factors, including:

Genetics: The most significant factor determining a Westie’s size is its genetic makeup. Genes inherited from its parents play a crucial role in determining the dog’s size, height, and overall body structure.

Lineage: The dog’s lineage or breeding history can also influence its size. Reputable breeders aim to maintain the breed standard, which includes specific size and height guidelines. Dogs bred from lines with a history of adhering to the standard are more likely to have predictable sizes.

Nutrition: Proper nutrition during the puppy’s growth stages is essential for achieving its full growth potential. A balanced diet with appropriate nutrients supports healthy bone and muscle development.

Health: The overall health of the Westie can impact its growth. Health issues or conditions that affect growth hormones or bone development may result in variations in size.

Neutering/Spaying: The age at which a Westie is neutered or spayed can have an impact on its growth. Early neutering or spaying before the growth plates have closed might lead to slightly taller dogs compared to those left intact.

Exercise: Regular exercise during puppyhood can promote healthy muscle development. However, excessive exercise or high-impact activities in very young puppies can lead to joint and bone issues that may affect their ultimate size.

It’s important to remember that while genetics play a significant role, there can be some natural size variations within the breed, and not every Westie will fit precisely within the breed standard’s specified height and weight range.

How Big Do Westies Get?

The average size of a fully grown West Highland White Terrier (Westie) is as follows:

  • Height: The typical height of a fully grown Westie is around 9 to 12 inches (23 to 30 cm) at the shoulder.
  • Weight: On average, adult Westies weigh between 15 to 20 pounds (6.8 to 9 kg).

It’s important to note that these are general guidelines based on the breed standard, and there can be some natural variation in size among individual dogs. Some Westies may fall slightly outside of this height and weight range while still being considered healthy and well within the breed’s standard.

If you have a Westie puppy, remember that they go through a rapid growth phase during the first few months of life. It’s essential to provide them with proper nutrition, exercise, and regular vet check-ups to ensure they reach their full growth potential and develop into healthy adult dogs.

When Do Westies Stop Growing?

West Highland White Terriers (Westies) typically stop growing in height and reach their full physical maturity between the ages of 12 to 18 months. During this period, they will go through their main growth spurt and gradually develop into their adult size.

However, it’s essential to understand that even after they reach their full height, they may continue to gain some weight and fill out for a few more months. The development of muscle mass and body structure may take a bit longer to complete.

By around 18 months of age, most Westies will have reached their adult size, and their physical appearance will remain relatively stable throughout their adult life. From this point forward, their growth will generally be limited to minor changes in weight and muscle tone based on their diet, exercise, and overall health.

When Do Westies Calm Down?

The energy level and behavior of West Highland White Terriers (Westies) can vary from dog to dog. Typically, Westies are known for their lively and spirited nature, and they tend to be energetic and playful throughout their early years. However, as they mature and reach adulthood, they often start to show signs of calming down.

Most Westies begin to mellow out and become less hyperactive as they approach 2 to 3 years of age. By this time, they have passed through their puppy and adolescent stages, and their energy levels tend to decrease. They may still be playful and active, but they are generally more relaxed and easier to manage compared to their younger selves.

It’s essential to provide consistent training and mental stimulation during their early years to help them develop good behavior and manners. Regular exercise and engaging activities will also contribute to a well-behaved and well-adjusted adult Westie.

Remember that individual dogs may have different personalities and temperaments, so some Westies may remain more energetic than others even in adulthood. Training and socialization play a significant role in shaping their behavior, so starting early with positive reinforcement training can help in creating a well-behaved and calm adult Westie.

Do Males and Females Grow the Same Size?

In general, male and female West Highland White Terriers (Westies) are quite similar in size. Both genders typically fall within the same height and weight range specified in the breed standard. However, there might be some slight differences between individual dogs.

On average, male Westies might be slightly larger and heavier than females, but this is not a strict rule, and there can be plenty of overlap in size between males and females. The actual size difference, if any, is usually minimal and not significant enough to be a major consideration when choosing between a male and female Westie.

It’s important to remember that size is just one aspect of a dog’s personality and characteristics. Temperament, behavior, and compatibility with your lifestyle are equally important factors to consider when choosing a Westie as a pet. Whether you choose a male or female Westie, both can make loving and loyal companions.

How To Measure the size of a Westie?

Measuring the size of a West Highland White Terrier (Westie) is a simple process that you can do at home. Here’s how you can measure your Westie:

Measure the Height:

  • Stand your Westie on a flat surface, such as the floor.
  • Make sure your Westie is standing tall and not slouching or stretching upward.
  • Use a measuring tape or ruler to measure from the ground to the highest point on the shoulder (the withers) of your Westie.
  • Record the measurement in inches or centimeters.

Measure the Length:

  • With your Westie still standing, measure from the base of the neck (where the neck meets the shoulders) to the base of the tail.
  • Again, record the measurement in inches or centimeters.

Measure the Weight:

  • Weigh your Westie using a pet scale or a bathroom scale (if you can weigh yourself first and then weigh yourself while holding your Westie to calculate the difference).
  • Make sure to weigh your Westie when they are calm and not struggling.

Remember to be gentle and patient while measuring your Westie’s size, as some dogs may not be comfortable with this process. If your Westie is uncooperative or anxious, you can try using treats or rewards to keep them still and calm during the measurement.

These measurements will help you track your Westie’s growth and ensure they are within the breed standard’s size guidelines. It’s also useful information to have when choosing the right size of accessories, like collars or coats, for your furry companion.

Westie Life Expectancy

The average life expectancy of a West Highland White Terrier (Westie) is around 12 to 16 years. However, with proper care, a healthy lifestyle, and regular veterinary check-ups, some Westies have been known to live even longer.

As with any breed, individual factors such as genetics, diet, exercise, and overall health play a significant role in determining a Westie’s lifespan. Regular exercise, a balanced diet, dental care, and maintaining a healthy weight can all contribute to a longer and healthier life for your Westie.

It’s important to be aware of potential health issues that are more common in the Westie breed, such as skin allergies, hip dysplasia, and certain eye conditions. Regular visits to the veterinarian can help catch any health concerns early and ensure your Westie receives appropriate care throughout its life.

Providing your Westie with a loving home and meeting its physical and emotional needs will contribute to a happy and fulfilling life for your furry companion.

Fun Facts About Westies

Sure! Here are some fun facts about West Highland White Terriers (Westies):

Origin: Westies originated from Scotland, specifically the West Highlands, which is how they got their name. They were originally bred for hunting small game, such as rats and foxes.

White Coat: Westies are known for their beautiful white coat, which is their defining feature. The all-white coat helps them stand out against their prey during hunting.

Double-Coated: Despite their elegant appearance, Westies have a double coat consisting of a dense, soft undercoat and a harsh, wiry outer coat. This coat helps protect them from harsh weather and provides insulation.

Dug King: The West Highland White Terrier is sometimes referred to as the “Dug King” due to their popularity as a choice for various advertising campaigns, especially for companies like Cesar pet food and Black & White Scotch whisky.

Tenacious Terriers: Westies are terriers, and like other terrier breeds, they are known for their determination and feisty nature. They have a strong prey drive and can be persistent when they set their minds to something.

Royal Connections: Westies have had some notable royal connections. King James VI of Scotland, later James I of England, was known to have owned white terriers similar to Westies.

Pop Culture: Westies have appeared in popular culture, including movies, TV shows, and books. For example, the character “Baxter” from the movie “Anchorman: The Legend of Ron Burgundy” is a Westie.

AKC Recognition: The American Kennel Club officially recognized the West Highland White Terrier breed in 1908.

Westie Walks: Westies are social dogs and enjoy being outdoors. Taking them for daily walks or engaging in interactive playtime is essential to keep them happy and mentally stimulated.

Excellent Watchdogs: Despite their small size, Westies make excellent watchdogs. They are alert, quick to bark, and will alert their owners to any potential intruders or unusual sounds.

Remember that while Westies can be fun and affectionate companions, they are also intelligent and independent dogs that benefit from early training and socialization. These fun facts are just a glimpse into the fascinating world of West Highland White Terriers!

Westie Full Grown: Frequently Asked Questions

When is a Westie considered fully grown?

Westies are typically considered fully grown in terms of height and physical maturity between 12 to 18 months of age.

How big do fully grown Westies get?

On average, fully grown Westies stand around 9 to 12 inches (23 to 30 cm) tall at the shoulder and weigh between 15 to 20 pounds (6.8 to 9 kg).

Do male and female Westies grow to the same size?

Generally, there might be slight differences in size between male and female Westies, but they both typically fall within the same height and weight range specified in the breed standard.

When do Westies stop growing in height?

Westies usually reach their full height between 12 to 18 months of age. By this time, their growth plates have closed, and they have achieved their adult height.

When do Westies stop growing in weight?

While the height growth plate closes around 12 to 18 months, Westies may continue to gain some weight and fill out for a few more months as their muscle mass and body structure develop.

How long do Westies live?

The average life expectancy of a Westie is around 12 to 16 years, but with proper care, some Westies can live even longer.

Are Westies good with children?

Westies can be great family dogs and are generally good with children when properly trained and socialized. However, supervision and teaching children how to interact with dogs are essential to prevent any accidental rough play.

Do Westies shed a lot?

Westies are considered low to moderate shedders. Their double coat requires regular grooming to keep it in good condition and minimize shedding.

How much exercise do adult Westies need?

Adult Westies need regular exercise to keep them healthy and mentally stimulated. Daily walks and interactive playtime are essential to meet their exercise needs.

Are Westies easy to train?

Westies are intelligent and eager to please, but they can also be a bit independent and stubborn. Early training and positive reinforcement methods work best with this breed.


In conclusion, the West Highland White Terrier, or Westie, is a charming and spirited breed known for its bright white coat and lively personality. They are intelligent, affectionate, and make wonderful companions for the right families. Here are some key takeaways:

Westies are fully grown, in terms of height and physical maturity, between 12 to 18 months of age. They generally stand around 9 to 12 inches tall at the shoulder and weigh between 15 to 20 pounds.

The size of male and female Westies is typically similar, but there may be slight variations in individual dogs.

The lifespan of a Westie is around 12 to 16 years, with proper care and attention playing a significant role in their overall health and longevity.

Westies are known for their tenacious terrier nature, yet they are also affectionate and enjoy being part of a loving family.

Early training and socialization are essential for developing well-behaved and well-adjusted adult Westies.

They are moderate shedders and require regular grooming to maintain their beautiful coat.

Regular exercise and mental stimulation are necessary to keep adult Westies happy and healthy.

Westies bring joy and love to their families, and by providing them with proper care and a nurturing environment, you can ensure they live a fulfilling and happy life as your beloved companion.

Edward Hollon is an avid dog lover and writer, knowing all there is to know about our furry friends. Edward has been writing for petdii for three years now, wanting to use her knowledge for good and share everything she can with new dog owners. Edward has two dogs herself - a German shepherd called Banjo and a chocolate labrador called Buttons. Edward knows more than anyone how adjusting to new life with a puppy can turn your life upside down, and she wants to ease some of the burdens through her articles.