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Mastiff vs Saint Bernard

Side-by-side comparison across all 14 AKC trait ratings, with a clear verdict on which breed fits which kind of household.

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The bottom line

Mastiff vs Saint Bernard

People compare Mastiffs and Saint Bernards because they’re both massive, gentle giants that look like they could bench press a small car. On paper, they’re similar too. big, calm, great with kids, low barkers, heavy shedders. But if you’ve lived with one, you know the vibe is different. These aren’t interchangeable teddy bears; they’re dogs with distinct personalities shaped by their jobs. The Mastiff was bred to guard and intimidate. There’s a stillness to them, a quiet dignity. They’re not aloof, but they’re serious. You’ll feel like you’re living with a royal guard who happens to nap 18 hours a day. They’re deeply loyal and will position themselves between you and anything they perceive as a threat, even if that threat is a delivery guy holding a box. They drool, yes, but less than the Saint Bernard. and they’re slightly more reserved with strangers. The Saint Bernard, though? This dog still carries the soul of a rescuer. They’re goofy, curious, and deeply in tune with people. If you’re sad, they’ll lumber over and rest their head on your lap like they’ve got a rescue mission for your heart. They were bred to find lost travelers in snowstorms, and that instinct shows in their expressiveness and warmth. But be warned: the drool is legendary. You’ll need towels in every room. Here’s the real talk: both are prone to bloat and joint issues, and feeding either is like running a small bakery. But the Mastiff’s shorter lifespan. sometimes just six years. can gut you. You’re signing up for heartbreak, but also for a love so deep it changes you. Pick the Mastiff if you want a stoic protector. Pick the Saint Bernard if you want a gentle, drooly clown who thinks he’s a lap dog. Either way, your furniture will never survive.

Mastiff
Saint Bernard
27.5–30 in
Height
26–30 in
120–230 lb
Weight
120–180 lb
6–10 yr
Lifespan
8–10 yr
$1.5–4.0k
Puppy price
$1.5–4.0k
#29
AKC popularity
#48

Trait-by-trait

Higher bar = more of that trait. Shedding, barking, drooling, grooming flipped for readability.
Affectionate w/ Family
Good with Young Children
Good with Other Dogs
Shedding Level
Coat Grooming
Drooling Level
Good with Strangers
Playfulness
Watchdog / Protective
Adaptability
Trainability
Energy Level
Barking Level
Mental Stimulation Needs
AffectionGood w/ KidsGood w/ DogsShedding LevelGroomingDrooling LevelGood w/ StrangersPlayfulnessProtectiveAdaptabilityTrainabilityEnergy LevelBarking LevelMental Stim.
Mastiff Saint Bernard
Overlay

Where they diverge

Coat Grooming
Mastiff needs less grooming (1-point difference)
Mastiff
Drooling Level
Mastiff drools less (1-point difference)
Mastiff
The verdict

Choose the Mastiff if…

  • Families with older children
  • Experienced large-breed owners
  • Those wanting a calm guardian

Choose the Saint Bernard if…

  • Families with children
  • Those wanting a gentle giant
  • Cold climate households
  • You value coat groomingSaint Bernard scores higher here.
Mastiff Owner’s Guide
Everything you need before bringing your Mastiff home.
Breed variants, breeder red flags, and what to ask
First-week checklist and daily schedules by age
Training timeline from 8 weeks to adulthood
Health screenings, emergency card, and feeding portions
Grooming schedule, first-year costs, and what nobody tells you
Get Your Guide
Saint Bernard Owner’s Guide
Everything you need before bringing your Saint Bernard home.
Breed variants, breeder red flags, and what to ask
First-week checklist and daily schedules by age
Training timeline from 8 weeks to adulthood
Health screenings, emergency card, and feeding portions
Grooming schedule, first-year costs, and what nobody tells you
Get Your Guide

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