Blue Boston Terrier: How rare are they?

blue boston terrier
The Blue Boston Terrier really exists

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If you’re thinking “What is a Blue Boston Terrier” after reading the title, we understand. We had no idea either. How can a dog be blue? But, they really exist. Well, they’re not really blue, but you’ll see what I mean.

The Blue Boston Terrier is a purebred Boston Terrier and even the American Kennel Club recognizes them if both parents are registered.

But where does that color come from? We know that Boston Terrier dogs are usually:

  • Black and White
  • Black Brindle and White
  • Brindle and White
  • Seal and White
  • Seal Brindle and White

So, how come these are blue, and are they different from other Boston Terriers?

Blue Boston Terrier

The Blue Boston Terrier isn’t really blue. They are more grey in color.

They have a lighter coat that looks grey and sometimes has a lilac hue to it. This color is a result of a gene mutation. Because of this gene mutation, their black color gets diluted and it looks grey. This is also called Chromosome 25 in canines.

Chromosome 25

In a recent article titled “Blue Great Dane: What makes them different” we explained the gene mutation. But, let’s go over it again.

You have to know that your dog’s color is created from two pigments: eumelanin and pheomelanin. Both of these pigments have a set color, but that color can also be altered by different genes.

In our case, the eumelanin pigment is important now. The black coat is caused by that pigment, the eumelanin pigment. But, there are other genes that turn the black color into liver, blue or isabella, or violet. So, if your Boston Terrier has a special recessive gene, the Chromosome 25, it will turn their black coat into a blue coat. So, it will dilute the black color.

But, this pigment doesn’t only give your dog’s coat its color. It also affects the eyes and the nose.

The second pigment that isn’t as important for this article is the pheomelanin pigment, but we’re going to mention it anyway. Basically, it’s a red pigment that covers shades like deep red, yellow, orange, gold, and light cream.

What do they look like

Now we know why some Boston Terriers are grey (or blue). But what other differences are there? How does the grey Boston Terrier look like?

The Blue Boston Terrier looks almost the same as any other Boston Terrier. They are small dogs with short tails. They are usually between 15 and 17 inches tall and weigh between 12 and 25 pounds.

You can easily recognize these dogs because they look like they’re wearing a tuxedo. This is why they have the nickname “The American Gentleman.”

What Blue Boston Terriers look like

But there are some things that set them apart:

  • they have a blue (grey) and white coat. It can be light to medium blue and it can even darken as they age.
  • these dogs can have white markings in their nose, paw padds and even eye rims
  • the blue color that stays the lightest is the blue from Boston Terriers with brindle coats. So, they don’t have a diluted black coat, but a diluted brindle coat.

Blue Boston Terrier puppies have grey eyes, but they can look light blue. However, their eyes will get darker as they age and will turn into a hazel-brown color

These dogs are very rare. You won’t come across this color very often. And also, to get this color both parents have to carry the gene that’s responsible for diluting the black coat color.

Health problems

Many experts believe there is a connection between the coat and eye color and many health problems in dogs. So, dogs with a lighter coat or light eyes can have more health problems than dogs with dark coat color and dark eyes. Unfortunately, it’s not clear why that is.

This problem also affects the Blue Boston Terrier. Many people reported that their grey Boston Terrier has hair loss, skin problems, allergies and some even say their dogs are deaf! Also, the risk of serious skin irritations and sunburn is much higher too.

There’s also a study that confirms dog with light coat colors has a very high risk of going deaf. Dogs that are the most affected have the following coat colors:

  • white
  • piebald or white with spotting
  • roan or white and grey mixed through the coat
  • merle or also desaturated colors, so when black become greys or blues

Because the blue Boston terriers have a higher chance of unilateral or bilateral deafness. Depending on how their coat looks like and if one or both ears are white.

Dog breeders are aware of this, yet they continue to breed dogs that have a high chance of becoming sick. They want to breed Blue Boston Terriers because they are popular and for the money. They don’t care what happens with the dog later.


The Blue Boston Terrier is a beautiful and rare dog. They have all the best traits of a Boston Terrier but with a unique color. So, if you’re only looking for that, then they are the dog for you.

But, we would never encourage you to get one. First of all because of the price. They can cost up to 2500 dollars. And secondly, because these dogs can be very sick.

Because of their color and the rare gene they carry they are more susceptible to certain health problems. Of course, your breeder won’t tell you this. They only want your money, they don’t care what will happen to the dog.

We don’t want to scare you, but the grey or blue color is beautiful. But it’s not worth it. You should go for a healthy dog, choose a breed by its characteristics. And not only looks.

So, you should do a lot of research on Blue Boston Terriers and all the risks that come with them. Know that it’s a big responsibility and a lot of work. After that, you can decide if they are really the dog for you.

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