Get

In Your Inbox

Dogster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Bullmastiff vs. English Mastiff: Differences Explained (With Pictures)

Share

Bullmastiff vs. English Mastiff

Many pet owners looking for a Mastiff as a pet may wonder what the differences are between the Bullmastiff and the English Mastiff. There are quite a few similarities; they are around the same size and live for around the same amount of time if taken care of.

However, the differences appear when you learn which environments are ideal for the dogs to be raised in. For example, the Bullmastiff does fine with apartment living, while the English Mastiff needs room to run. Both are family-friendly, but the English Mastiff is loyal and stubborn, while the Bullmastiff is loyal and affectionate.

If you’re wondering which breed will be the best choice of pet for you, join us as we explain the differences between these two loyal canines.

divider dog paws 3 oct 2024

Bullmastiff vs English Mastiff: Visual Differences

Dogster_Side by Side Comparison_Bull Mastiff vs English Mastiff
You’re welcome to use our images, but we require you link directly to this site for credit (ex. Image from Dogster)

At a Glance

Bullmastiff
  • Average height (adult): 23–27 inches
  • Average weight (adult): 100–130 pounds
  • Lifespan: 8–10 years
  • Exercise: 1+ hours a day
  • Grooming needs: Moderate
  • Family-friendly: Yes
  • Other pet-friendly: Usually not
  • Trainability: Loyal, affectionate
English Mastiff
  • Average height (adult): 27–36 inches
  • Average weight (adult): 120–230 pounds
  • Lifespan: 6–10 years
  • Exercise: 30–40 minutes a day
  • Grooming needs: Moderate
  • Family-friendly: Yes
  • Other pet-friendly: Often
  • Trainability: Loyal but stubborn

divider dog paws 3 oct 2024

Bullmastiff Overview

bullmastiff dog standing in an open field
Image Credit: Michael J Magee, Shutterstock

The history of the Bullmastiff begins in 1860 in England. The Bullmastiff is a working dog bred for an interesting purpose; instead of being produced as a hunting dog, it was bred to protect wildlife. Large English estates had a poaching problem, so gamekeepers were hired to protect game from poachers. These gamekeepers needed a large dog that could move fast but stay quiet. The dog also had to be a good tracker and able to catch poachers without mauling them. After a lot of careful breeding, they wound up with the Bullmastiff.

The gamekeepers had tried several breeds, most importantly, the Mastiff and the Bulldog. The Mastiff proved to be too slow, and the Bulldogs of the time were far too ferocious. Gamekeepers began to breed the two dogs together and found a perfect 60% Mastiff and 40% Bulldog mix, which they called the Bullmastiff.

The breed gained the nickname “The Gamekeepers Night Dog” and would continue working with gamekeepers for over half a century. The Bullmastiff was imported into America and became popular fast. The AKC recognized them in 1933, and a pair of full-grown males were imported in 1934 by the Rockefellers to patrol their massive estate.

Personality/Character

The Bullmastiff is known for being intensely loyal and very protective. They are affectionate and gentle towards their family, but that attitude can change when a stranger enters the picture. The Bullmastiff is very standoffish with strangers and can become aggressive if it thinks the stranger is dangerous.

It’s essential to ensure you properly socialize your Bullmastiff when it’s young to avoid aggression toward strangers.

Bullmastiff dog resting on the grass
Image Credit: karinwoerdehoff, Pixabay

Training

The Bullmastiff is, unfortunately, not an easy dog to train. Despite their intelligence and eagerness to please, their stubbornness makes training them difficult, especially for first-time dog owners. It takes an experienced hand to guide the Bullmastiff, but once trained, it’s a loyal and obedient dog.

Suitable For:

The Bullmastiff is perfect for anyone looking for a guard dog, but that’s not all they’re meant for. Despite their original use, the Bullmastiff makes an excellent companion, even in apartments, despite its larger size. The breed is even fit for families with children; they’re known for treating children with great care.

However, you probably want to pass on the Bullmastiff if you have other pets. They’ve been known to be aggressive with other animals, especially other dogs.

divider dog paws 3 oct 2024

English Mastiff Overview

English Mastiff drooling
Image Credit: GoDog Photo, Shutterstock

The English Mastiff, officially known as simply the Mastiff, traces its roots back to the Roman Empire. As was typical for them, the Romans were attempting to conquer the island of Britannia or, as we know it, Britain. The Roman legions brought along their dogs that wound up breeding with the native dogs and creating the Mastiff. The Romans were fond of the Mastiff and exported many back homes, where they commonly fought in the Coliseum.

Over the centuries, the British people became enamored with the Mastiff, and many began to bicker over which characteristics defined a dog as a “true Mastiff.” These arguments created the standards we have for the Mastiff. Despite the British owners’ love for the breed, it almost went extinct there due to World War I and II. At a time when many were struggling to feed themselves, they weren’t interested in breeding dogs that would eat just as much as a fully grown man.

Luckily, after the wars, North American breeders were happy to send some Mastiffs back across the pond to their ancestral home.

Personality/Character

The Mastiff is well known for its incredible loyalty and bravery but also for its restraint. Even though the Mastiff could easily hurt or even kill a large number of creatures on earth, it’s been noted that most have great restraint when dealing with smaller creatures and will endure annoyance or attacks from them; this includes other dog breeds and small children.

Despite the laid-back attitude the breed often displays, they are hyper-protective. If a Mastiff feels someone is in trouble, regardless of whether the person is their family, they’ve been known to jump into action.

english mastiff on a field
Image Credit: Monica Arauz, Shutterstock

Training

The English Mastiff can be easily taught basic commands and obedience but are stubborn and have short attention spans. They may neglect training because it simply doesn’t interest them and may even walk off while you’re trying to teach them. For the Mastiff, it’s best to keep training short so you keep their attention.

You also must be careful not to upset your Mastiff while training, as they can become even more difficult to train while scared or confused. If you have hurt your Mastiff’s feelings, it may even refuse to engage in the training. It’s important to begin training your Mastiff at an early age, especially regarding socialization. Socializing them early will prevent bad behavior towards strangers and other dogs.

Suitable For:

The English Mastiff is an excellent breed for anyone who has room for it. It gets along well with children and other pets and is typically a calm canine. The Mastiff is not the dog for anyone lacking space; a Mastiff without the proper space and exercise can become impatient and destructive. If you don’t have the space or the time to devote to a Mastiff, they are not for you.

divider dog paws 3 oct 2024

Bullmastiff vs. English Mastiff: Which Breed Is Right for You?

Bullmastiff vs. English Mastiff
Image by: (L) photosounds, Shutterstock | (R) Monica Arauz, Shutterstock

As you can see, the Bullmastiff and the English Mastiff have their similarities, but they also have their differences. The Mastiff is an excellent breed for experienced dog owners with large yards for the dog to run freely.

On the other hand, the Bullmastiff makes an excellent pet for someone looking for a guard dog and living in an apartment or small home, as they don’t need nearly as much space to run as the English Mastiff does. With either of these dogs, you must ensure you have the time and dedication it takes to train and socialize them to be the loyal pets they were meant to be.

See also:


Featured Image Credit: (T) DejaVuDesigns, Shutterstock | (B) tamara321, Shutterstock

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything dog

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.




How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Dogster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Dogster’s Weekly Photo Contest Winners: Best Easter Photo (April 9, 2026)

Every week our team gets the privilege of sorting through our readers photos to choose what dogs will win this weeks contest! See...

We Didn’t Just Add a Dog to Our Life – We Built a Life With Him

“We didn’t just bring a dog home—we built a life together.” Most people are quietly taught a version of pet ownership that looks...

What Most Airlines Won’t Let You Do With Your Dog (Even If You Pay Extra)

Airline pet policies are notoriously hard to navigate. The information is scattered across different pages, buried in FAQ sections, and often contradicts what...

Designer Breeds: Best of Both? New Study Says No

“I’ll take a highly trainable, low-shedding lapdog, hold the heart disease and anxiety!” Something I always found amusing was when people would point...

More related

10 Best Dog Foods for Hypothyroidism in 2026 — Reviews & Top Picks

A dog’s thyroid gland is located in their neck and has two lobes, one on each side of the trachea. The thyroid is...

Top 4 Dog Friendly Beaches in Wilmington, NC 2026: Off & On Leash Places to Go

What better way to spend a summer afternoon than with your four-legged best friend on the beach? But which beaches in Wilmington, North...

5 Health Problems in German Shorthaired Pointers: Vet Approved Facts

As an energetic and lively breed, German Shorthaired Pointers are prone to a few health problems. Pet owners should be aware of health...

Parti Yorkie vs. Standard Yorkie: Key Differences (With Pictures)

Many potential Yorkie owners wonder if there is any difference between the parti Yorkie and the Standard Yorkie. There are actually more similarities...

Keep reading

Is It Bad to Switch Dog Food Often? Vet-Reviewed Facts & FAQ

A mistake that many dog owners make is finding good dog food and sticking to it forever. In fact, that’s the advice that many people give—advice that may have even come from your parents when you adopted your first dog....

dalmatian dog eating dry food from a bowl

Can Dogs Eat Cheetos? Vet-Approved Reasons, Risks, & FAQ

If you’re a dog owner, the chances are high that you’ve experienced something similar to the following situation. You finally get a chance to sit down and relax after a long day, and you take the opportunity to open a...

Can Dogs Eat Cheetos

Solid Gold Puppy Food Review 2026: Recalls, Pros & Cons

Review Summary The Solid Gold dog food brand came to be in 1974 and during the early years, most of their foods contain more natural ingredients that were based on a holistic diet. The company was founded by Sissy Harrington...

Dogster_Solid Gold Puppy Food Review

Can Adult Dogs Eat Puppy Food? Vet-Approved Facts & FAQ

We all know that there is puppy food and adult dog food. If you are the proud owner of a new puppy, congratulations! But if you already have an adult dog in the home, you know that there’s potentially going...

Can Adult Dogs Eat Puppy Food

Hill’s Science Diet Dog Food Review 2026: Pros, Cons, Recalls & FAQ

Review Summary Most people are somewhat familiar with Hill’s Science Diet dog food, which has been around since the 1930s. That’s when Morris Frank—a man promoting the concept of using dogs to enable the blind—met Dr. Mark Morris, Sr. Frank’s...

Dogster_Hill’s Science Diet Dog Food Review

Evolve Dog Food Review 2026: Recalls, Pros & Cons

Review Summary If you’re looking at different food brands, and trying to decide what would work best with your pooch—let us introduce you to Evolve. It can work very well for the right canine, and we want to explain what...

Dogster_Evolve Dog Food Review

What Is Crude Fat in Dog Food & How Much Should There Be? Vet-Verified Facts

When feeding your furry canine companion, you want only the best high-quality food containing the best ingredients. When researching the best food, you’ll often run across crude fat in the ingredients and probably wonder what it is or how much...

Black Dachshund dog guarding and eating food

Can Dogs Eat Flan? Vet-Reviewed Potential Risks & Safety Guide

Flan is a custard-like dessert that can contain several ingredients. However, it typically contains eggs, milk, and sugar. While dogs can eat a small amount of dairy products like flan, it isn’t recommended. While flan isn’t toxic, it isn’t usually...

Can Dogs Eat Flan

Love Dogs? So Do We! Join the Dogster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Dogster Email Newsletter