Boston Terrier vs Bullmastiff

Which dog breed is right for you?

Boston Terrier

Size
12–25 lbs, 15–17 in
Lifespan
11–13 years
Exercise
Moderate
Grooming
Low
Good with Kids
Yes
Good with Pets
Yes
Friendly Bright Amusing Adaptable

Bullmastiff

Size
100–130 lbs, 24–27 in
Lifespan
7–9 years
Exercise
Moderate
Grooming
Low
Good with Kids
Yes
Good with Pets
No
Loyal Calm Protective Brave

About the Boston Terrier

The Boston Terrier — affectionately known as the "American Gentleman" — was developed in Boston, Massachusetts, in the late 1800s from crosses between English Bulldogs and white English Terriers. Standing 15–17 inches tall and weighing 12–25 pounds, they come in three weight classes and sport a compact, well-proportioned build with a distinctive tuxedo-like coat pattern. Their short, smooth coat appears in black-and-white, brindle-and-white, or seal-and-white — always with the characteristic white blaze, muzzle band, and chest marking.

Temperament & Personality

Boston Terriers are lively, intelligent, and brimming with personality — they have a wonderful sense of humor and seem to know exactly how to make their owners laugh. They are exceptionally friendly with people of all ages, including children and seniors, and typically get along well with other dogs and cats. Their moderate energy level and adaptable nature make them equally happy on a brisk walk or curled up on the couch.

Pros

  • Perfect apartment dog — compact size, moderate exercise needs, and minimal barking
  • Friendly and sociable with virtually everyone, including strangers and other pets
  • Low-maintenance coat requiring only occasional brushing
  • Highly adaptable temperament that suits first-time owners and experienced dog people alike

Cons

  • Brachycephalic (flat-faced) structure causes breathing difficulties, snoring, and heat intolerance
  • Prone to eye injuries and conditions like cataracts, cherry eye, and corneal ulcers
  • Can be stubborn about housetraining despite their intelligence
  • Susceptible to patellar luxation and spinal issues due to their compact build

Boston Terriers are the perfect blend of charm and companionship — find adoptable Boston Terriers on Puplister now.

About the Bullmastiff

The Bullmastiff was developed in 19th-century England by crossing Bulldogs with Mastiffs — the goal was a powerful, silent guardian capable of tracking and pinning poachers on large estates without mauling them. Standing 24–27 inches tall and weighing 100–130 pounds, the Bullmastiff is a massive, muscular dog with a broad head, dark muzzle, and an imposing physical presence. Their short, dense coat comes in fawn, red, or brindle — always with a black mask — and sheds moderately with minimal grooming requirements.

Temperament & Personality

Bullmastiffs are confident, loyal, and naturally protective — they are alert guardians who rely on their size and intimidating presence rather than excessive barking to deter intruders. Despite their imposing appearance, they are gentle and affectionate with their families, showing particular patience and tenderness with children. They are typically calm and quiet indoors, content to lie at their owner's feet, but they can be territorial with unfamiliar dogs and require early, consistent socialization.

Pros

  • Naturally protective — their imposing presence alone is an effective deterrent
  • Surprisingly low-energy indoors, adapting well to a calm household routine
  • Gentle and affectionate with family members, including children
  • Minimal grooming needs with their short, easy-care coat

Cons

  • Short lifespan averaging only 7–9 years
  • Prone to bloat, hip and elbow dysplasia, lymphoma, and mast cell tumors
  • Significant drooling, especially around mealtimes and in warm weather
  • Their sheer size and strength require an experienced owner capable of managing 100+ pounds of dog

A Bullmastiff offers protection and companionship in equal measure — explore adoptable Bullmastiffs on Puplister and find your gentle giant.

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Frequently Asked Questions

What is the difference between a Boston Terrier and a Bullmastiff?
The Boston Terrier is 12–25 lbs, 15–17 in sized while the Bullmastiff is 100–130 lbs, 24–27 in sized. They differ in size (12–25 lbs, 15–17 in vs 100–130 lbs, 24–27 in), lifespan (11–13 years vs 7–9 years), and care requirements.
Which breed is better with kids, Boston Terrier or Bullmastiff?
Boston Terrier is generally good with kids. Bullmastiff is generally good with kids.
Which breed lives longer, Boston Terrier or Bullmastiff?
The Boston Terrier has a lifespan of 11–13 years while the Bullmastiff has a lifespan of 7–9 years.

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