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Home > Dogs > How Big Do Boston Terriers Get? (Size & Growth Chart)

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

boston terrier with collar

Boston Terriers are lovable companions that are always ready to play or show their humans affection. The tough little dogs are a bit compact, averaging 15–17 inches in height and weighing around 12–25 pounds when fully grown. Of course, not every Boston Terrier will be the same size. You’ll find that genetics, care, diet, and even gender play a role in how big these dogs will get. Now, let’s take a crack at answering how big Boston Terriers get so you can be better prepared if you’re planning on bringing one of these amazing dogs into your home.


Facts About Boston Terriers

Originating during the 1860s, the Boston Terrier is a cross between a Bulldog and a White Terrier. One of the most noticeable things about these dogs is their tuxedo coats which have earned them the nickname, “American Gentleman.” Not as excitable as a full-blooded terrier, these dogs are known for being affectionate with their humans. They prefer being with their families above all else. They are very intelligent, making them easy to train, and have been considered one of the most popular dog breeds since 1905.

Boston Terrier posing in garden
Image By: Ruben PH, Shutterstock

Boston Terrier Size and Growth Chart

When bringing a Boston Terrier puppy home, it’s normal to be curious about how big they may get and how fast they’ll grow. There’s a bit of difference in weight when it comes to male and female Boston Terriers, but they are very similar when it comes to size. Females of this breed will be a bit lighter in most instances.

Age Weight Range Length Range
2 months 4.5 pounds 6–8 inches
4 months 8–9 pounds 10 inches
6 months 14 pounds 12 inches
8 months 19–20 pounds 13–14 inches
10 months 21 pounds 15 inches
12 months 23 pounds 16 inches
14 months 25 pounds 17 inches

When Does a Boston Terrier Stop Growing?

In general, most dog breeds stop growing around 12 months of age. However, Boston Terriers are a smaller breed and they begin slowing down a bit earlier than some bigger breeds. Female Boston Terriers typically stop growing at 1 year old. Males, since they mature slower, may continue growing until they are around 14 months old.

boston terrier posing in the park
Image By: Eve Photography, Shutterstock

Factors Affecting the Size of Boston Terrier

Like with most dogs, the size of a Boston Terrier can be affected by genetics, the care they receive, and the dog’s activity level. If the dog in question’s parents were considered to be the smaller size, most likely their offspring will be as well. The same can be said if the parents are larger than normal.

The care you give them when it comes to their diet is another big factor for your dog. A proper diet is crucial. Dogs need high-quality food that is high in protein. This is especially true for Boston Terriers since they are an active breed. Always research brands before deciding on a particular one for your dog. If you have questions, your veterinarian will help you determine which way to go.

You’ll also need to keep your Boston Terrier active. Yes, they are naturally on-the-go dogs. However, they do prefer being with their owners. If you live an inactive lifestyle, your dog is most likely to do so as well. Make sure your dog gets proper exercise to avoid obesity and other health issues as they age.

Ideal Diet for Maintaining a Healthy Weight

One of the most important things you should remember when choosing dog food for your Boston Terrier is the life stage. Puppies should eat foods that are specifically developed for their growing needs. Puppies usually eat 3 or 4 small meals per day to keep up with the calories they are constantly burning.

Once your dog is fully grown, you’ll need to switch to adult life-stage foods. This food should have all the vitamins, minerals, nutrients, and proteins your veterinarian feels your dog needs. You’ll also change the feeding schedule. Feeding your dog a larger portion of food twice a day will help keep them fit and healthy.

boston terrier dog lying
Image By: bubutu, Shutterstock

How to Measure Your Boston Terrier

If you want to keep up with your Boston Terriers’ growth between veterinarian visits, it’s easier than you’d expect. To weigh your dog, if they won’t sit on the scale for you, simply weigh yourself first. Once you have your weight, pick your dog up and weigh again. The difference is your dog’s weight.

When measuring your dog’s height, you’ll need a soft tape measure. Get your dog to stand still and straight. Start at the floor and measure up to your dog’s shoulders. This is the area where the shoulder meets the neck.



Boston Terriers are not only amazing, loving dogs, they are compact, muscular dogs that love to be active. Considered a small dog breed, on average, Boston Terriers grow to be 15–17 inches in height. When it comes to weight, Boston Terriers can weigh anywhere between 12–25 pounds. If you’re considering one of these amazing dogs as a companion in your home, we can’t blame you. These adaptable cuties can make perfect pets for apartments, tiny homes, or large family dwellings.

Featured Image Credit: Vera Zinkova, Shutterstock

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