Mastiff vs Newfoundland

Where Mastiff and Newfoundland differ most

• Grooming needs: Mastiff 1/5 · Newfoundland 4/5Newfoundland much more upkeep
• Lifespan: Mastiff 6–10 yrs · Newfoundland 9–10 yrsNewfoundland much longer-lived
• Adult weight: Mastiff 120–230 lbs · Newfoundland 100–150 lbsMastiff heavier
• Daily exercise: Mastiff ~40 min · Newfoundland ~45 minNewfoundland needs more
• Shedding: Mastiff 3/5 · Newfoundland 5/5Newfoundland sheds more
• Trainability: Mastiff 3/5 · Newfoundland 4/5Newfoundland easier to train

Full trait-by-trait breakdown

Which one should you choose?

Both are giant breeds with a calm, gentle reputation, but the Newfoundland carries an active love of water and a slightly more engaged, trainable temperament than the profoundly laid-back Mastiff, which is content to spend most of its day resting and asks very little in the way of structured activity. Grooming runs heavier for the Newfoundland, whose dense, waterproof coat sheds substantially and needs a committed brushing routine, compared with the Mastiff's short, simple coat. Both breeds are famously patient and gentle with kids, a genuine hallmark of each. Trainability tips slightly toward the Newfoundland, generally more willing and food-motivated in sessions than the more independent, sometimes stubborn Mastiff. Both come with the outsized food, vet, and space costs that giant breeds carry, and both tend toward shorter lifespans worth discussing with a vet. If you're near water and don't mind the extra brushing, the Newfoundland is the more engaged pick; if the goal is the lowest-maintenance, most sedentary giant-breed experience going, that's the Mastiff.