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Dog Breeds

Blue Boston Terrier: Info, Pictures, Facts & History

Elizabeth Gray
By Elizabeth GrayUpdated on July 4, 2026
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Boston Terriers were descended from Bulldogs and Terriers used for fighting and couldn’t be more different from their ancestors. They are fun-loving, energetic family dogs who want to be best friends with everyone they meet. Blue Boston Terriers have a rare color variation caused by a genetic mutation. Keep reading to learn more about the Blue Boston Terrier, including fun facts and the breed’s history.

Height:15-17 inches
Weight:12-25 pounds
Lifespan:11-13 years
Colors:Gray, silver, or blue with white markings
Suitable for:Families, seniors, and individuals looking for a social, playful pet
Temperament:Smart, friendly, active, entertaining, good with kids and other pets

Blue Boston Terriers are technically not allowed by breed standards. The only official colors are black, brindle, and seal (brown) with white. The Blue Boston Terrier is caused by a mutation of the color gene, resulting in a diluted black coat. Aside from their unusual color, the Blue Boston Terrier is typically the same as any other color in personality and size.

Blue Boston Terrier Characteristics

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The Earliest Records of Blue Boston Terriers in History

All modern Boston Terriers trace their ancestry back to a dog named Judge, who was bred in England in the 1860s. Judge was a mix between a Bulldog and a (now extinct) English Terrier. He was sold to an American, and Judge crossed the Atlantic to the United States.

This new American owner used Judge as the founder of a separate breed. American breeders selectively bred the new dog smaller and sweeter than Judge, intending them as pets instead of fighting dogs. The new Terrier was named after the city where it was developed, and Boston Terriers soon became beloved pets.

While we don’t know when the first Blue Boston Terrier was born, it could have been any time in the breed’s history. We know that the original breeders didn’t selectively choose the color as standard for the Boston Terrier, and Blue Boston Terriers have likely never been common.

Image Credit: Sharon Feragotti, Shutterstock

How Blue Boston Terriers Gained Popularity

Boston Terriers of all colors have always been intended as companion dogs. Despite their name, they have little in common with other Terriers, most of whom were bred to hunt rodents or fight. Boston Terriers, with their round heads and sweet faces, quickly became known as the “ladies’ pet” as opposed to the tougher Bull Terriers and Bulldogs associated with “manly” pursuits like dog fighting.

It took until the early 20th century for the modern look of the Boston Terrier to emerge from breeders. Again, Blue Boston Terriers were not included as standard colors for these early dogs, so we don’t know how many or how popular they were at the time. However, the homegrown Boston Terrier was the most popular dog in America by the 1910s.

Formal Recognition of Blue Boston Terriers

The Boston Terrier was originally called the American Bull Terrier, with the first breed club formed in 1891. However, Bull Terrier breeders objected to the name because the new breed had so little in common with their breed or Bulldogs. When the AKC recognized the new breed in 1893, the name had changed to Boston Terrier.

The American Kennel Club does not formally recognize Blue Boston Terriers. That means they can’t be registered or compete in dog shows. However, if a Blue Boston Terrier is born to registered parents, you may be able to register them, but showing them is still not allowed.

Image Credit: JStaley401, Shutterstock
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Top 3 Unique Facts About Blue Boston Terriers

1. Blue Boston Terriers Are Considered Brindle

If a Blue Boston Terrier is allowed to register with the American Kennel Club officially, they will do so as a “brindle and white” dog since ‘blue’ is not a recognized color category.


2. The Blue Coat Color Has Been Associated With Certain Health Issues

Color dilution alopecia is a condition associated with the blue coat color that is characterized by hair loss and skin problems. Pet parents should make sure to use very mild shampoos and conditioners with these pups to avoid causing any issues and always consult with a veterinarian if they have any concerns.


3. The Color Used to be Referred to as “Mouse”

In the early development of the Boston Terrier breed, the term "mouse" was used to describe those with a coat color that appeared gray or blue. This refers to the coloration of the nose. Historically, "mouse" described a gray or blue-gray coat color, and dogs with this coat often had noses that matched the coat color, appearing blue or gray. This nose color is referred to as "self-colored," meaning it matches the coat.

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Does the Blue Boston Terrier Make a Good Pet?

Blue Boston Terriers make wonderful pets for nearly any owner and living situation. They are social dogs who enjoy making friends with humans and other pets. A full grown Blue Boston Terrier is still a small dog, and although they have a lot of energy, their small size makes it easy for them to exercise even if they live in small spaces or city environments.

They generally love kids, but you should always supervise younger children who may not know how to be gentle yet. They are smart and respond well to gentle, positive training. Blue Boston Terriers usually only need a quick weekly brushing to keep their coat healthy, and they are not heavy shedders.

The biggest concern for Blue Boston Terrier owners is the breed’s health. Boston Terriers are a short-nosed, flat-faced breed prone to breathing issues. They are also extra sensitive to hot temperatures.

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Summary

Blue Boston Terriers may not be an officially recognized color variety, but they are still as charming and entertaining as any other Boston Terrier. You might have difficulty finding a Blue Boston Terrier for sale because they are rare. However, because the breed is prone to some inherited health issues, it is essential to research the breeders you find carefully. Make sure you get the healthiest Blue Boston Terrier possible, and ask your veterinarian about any precautions you should take to keep them that way.

See also:

Sources

Featured Image Credit: Rob Blaze, Shutterstock

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Elizabeth Gray
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Elizabeth Gray

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