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How Big Do Boston Terriers Get? (Size + Growth Chart)

Jeff Weishaupt

By Jeff Weishaupt

Boston terrier

Boston Terriers are great companion dogs. They have an affectionate nature towards humans, making them one of the most popular pets worldwide. These compact, sturdy dogs are always up for playing, running, and walking. Typically, Boston Terriers weigh between 12–25 pounds and stand 15–17 inches tall.

Some dogs might be slightly bigger or smaller depending on factors such as gender, diet, and genetics. As your puppy grows into an adult, you should check its nutrition to ensure its healthy development.

Whether you have a Boston Terrier or are looking to adopt one, this guide includes everything about the size and growth of this dog breed. So, keep reading till the end!

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Facts About Boston Terriers

Boston Terriers are friendly dogs with a gentle nature. Although they are popular for their unique “tuxedo” coats, there is much more you should know about these American Gentlemen.

Boston Terriers love to be around humans. They are people-oriented and prefer spending time with their owners and kids over being alone. These dogs are highly-intelligent, making them quick learners. They also instantly pick up tricks during training.

These dogs are nicknamed the “American Gentleman” because of their stylish tux coat and dapper appearance. Compared to other terrier breeds, Boston Terriers are less excited since they are not completely terriers. Instead, these dogs are a cross between a White Terrier (extinct) and Bulldog, dating back to the 1860s.

On top of all that, Boston Terriers have been the most or second most popular dog breed in the US from 1905 to 1935. In fact, they sustained their popularity throughout the 20th century.1

boston terrier on grass
Image Credit: Lenka N, Shutterstock

Boston Terriers: Size & Growth Chart

The Boston Terrier’s size varies depending on gender. A female may weigh lighter than a male, but they are almost the same when it comes to size.

Age Weight Range Length Range
3.5 months 5–13 pounds 11–12 inches
5 months 7–16 pounds 11–12 inches
6.5 months 8–18 pounds 12–13 inches
7.5 months 8–18 pounds 12–13 inches
8.5 months 9–19 pounds 13–14 inches
10 months 9–19 pounds 13–14 inches
11 months 9–19 pounds 13–14 inches
14 months 9–20 pounds 14–15 inches

When Does a Boston Terrier Stop Growing?

A dog becomes an adult when it turns a year old. Boston Terriers have a relatively less growth duration than large dog breeds. They usually stop growing when they hit the 10 to 14-month mark.

Female Boston Terriers stop growing at 12 months, while males may grow till 14 months. This dog breed generally grows rapidly in the first year. As an aware dog owner, you must take your dog to a vet for regular check-ups.

Boston Terrier
Image Credit: Introvertz3, Pixabay

The 3 Factors Affecting the Size of Boston Terriers

The size of Boston Terriers varies greatly based on the nutrition they get, their physical activity, and genetics. Here is why your Boston Terrier seems smaller or bigger than your friend’s:

1. Genetics

Genetics plays an essential part in your dog’s size, apart from carrying several health issues. While you can’t change your pup’s genetics, you should meet its parents at the time of adoption.

It may not always happen, but mostly a pup is expected to grow bigger if both its parents are big. Similarly, you can expect a small-sized dog from small parents.

2. Diet

A Boston Terrier needs highly nutritious foods to stay healthy and grow to their full size. Always thoroughly research the best foods for your dog before buying any.

There is a common belief that cheaper foods are less nutritious, but that’s not always the case. You can find many quality dog foods at an affordable price containing lots of healthy nutrition for your pet. However, some brands may contain dangerous ingredients.

To stay safe, you must consult your vet about your dog’s food. Also, make sure to give the proper dosage to your dog, depending on its age. Inappropriate food consumption may cause your Boston Terrier to malnutrition or become obese, leading to many other health issues.

boston terrier eating dog food
Image Credit: Jaja Fekiacova, Shutterstock

3. Physical Activity

Boston Terriers are generally energetic, lively, and playful dogs, requiring lots of exercise to stay happy throughout the day. Since these dogs are people-oriented, they don’t like to be alone.

Even if you leave them out in the backyard on their own, they won’t be very active and will look for you. This means you should play with your dog instead of leaving them alone. Exercising doesn’t only help them stay physically active but also strengthens their mental health.

Physical activity enhances your Boston Terrier’s bone structure and promotes healthy growth. It also improves your pet’s heart health, making them more resilient daily.

Ideal Diet for Maintaining a Healthy Weight

Puppies from every dog breed require a perfect diet to maintain their healthy weight. That’s especially the case during their growth period. An optimal diet allows Boston Terriers to grow healthily and lowers their chances of developing different health issues, such as obesity and a weak immune system.

When buying your dog’s food, search for those with the “All Life Stages” label. Evident from its name, this label means both puppies and adult dogs can consume this dog food. Many dog owners struggle with transitioning their puppy to an adult dog formula. However, “All Life Stages” food makes this relatively easy.

In a nutshell, the ideal diet for your Boston Terrier shouldn’t consist of too many carbohydrates. The food must not make your dog sick and should contain lots of nutrients.

man buying pet food
Image Credit: BearFotos, Shutterstock

How to Measure Your Boston Terrier

When adopting a Boston Terrier, you can measure the dog’s expected size in many ways. First, you can look at their paws. In about 10 weeks, the dog’s size will grow into its adult size.

Secondly, you can examine the Boston Terrier’s skin. This dog breed does not have loose skin. So, if your dog shows loose skin, it could be possible that you will have a bigger dog. The third metric of measurement is your terrier’s parents. If your dog’s parents are big, your pup will also be bigger.

Remember, these are just estimations and not scientifically proven. So, you can only use these ways to have an idea of what might be waiting for you in the future.

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Boston Terriers are compact dogs with a sturdy, muscular build. They typically weigh 12–25 pounds and measure about 15–17 inches in height. However, their weight and size vary depending on gender, genetics, nutrition, and physical activity levels. Females typically have less weight and size than males.

Proper nutrition is also crucial in helping the Boston Terrier grow to their maximum size. Ensure your dog’s food contains safe nutrients to avoid health issues. Besides, physical activities also encourage the growth of your Boston Terrier.

Stay in touch with your vet throughout your Boston Terrier’s growth period. Doing so will ensure that your pet grows healthily!

See also:

Featured Image Credit: Eve Photography, Shutterstock

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