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The Bullmastiff is a large sized breed of dog with a short muzzle and a solid build. They shared lots of traits with the Molosser dogs and were developed for guarding estates. They have a lifespan of 8 to 10 years and have a height of about 62cm. They are big dogs weighing about 51kgs.

Adult Size

  • Huge

Amount of Shedding

  • Sheds Little
  • Sheds Nearly Not at All

Appropriate Environment

  • Apartment
  • Fenced In Yard
  • House
  • Invisible Fenced Yard

Behavior if Left Alone

  • Can Be Left Alone
  • Comfortable Being Left Alone

Breed Group

  • Working Group

Coat Length

  • Very Short Coat

Coat Quality

  • Smooth Coat


  • Fawn
  • Fawn Brindle
  • Red
  • Red Brindle
  • Red Fawn
  • Red Fawn Brindle


  • Drools Constantly

Energy Level

  • Get Up? Me?
  • Would Rather Not Go Jogging With You

Exercise Needs

  • Rarely Needs Exercise
  • Total Couch Potato

Full Grown Height

  • 24-26″
  • 27-30″

Full Grown Weight

  • 101-110lbs
  • 111-120lbs
  • 121-130lbs

General Health

  • Not a Very Healthy Breed

Good Choice for New Dog Owners

  • Good Dog for Your First Dog
  • Very Good for Your First Dog!

Good Dog for Cold Weather?

  • Can Manage in Cold Weather
  • Tolerates Cold Weather Well

Good Dog for Hot Weather?

  • Doesn’t Do Well in Hot Weather

Good With Children?

  • Good with Kids
  • Great With Kids


  • Doesn’t Require Grooming


  • Smart
  • Very Intelligent


  • Affectionate
  • Very Affectionate


  • Playful
  • Very Playful

Recommended OFA Tests

  • Autoimmune Thyroiditis – OFA evaluation
  • Congenital Cardiac Database ARCH – ACVIM Registry of Cardiac Health – or – OFA evaluation
  • Elbow Dysplasia – OFA Evaluation
  • Eye Examination by ACVO Ophthalmologist
  • Hip Dysplasia OFA/OVC Evaluation or PennHIP
  • Kidney Disease (Optional) OFA evaluation

Social Behavior with Dogs

  • Socializes Sometimes with Other Dogs

Top Life Expectancy

  • 10 years
  • 8 years
  • 9 years

Training Tendencies

  • Easy to Train

Vocalization Tendencies

  • Almost Never Barks or Howls
  • Barks or Howls Appropriately