The biggest dog we have ever slept beside was a Weimaraner. He was longer than Jackie is tall. Every night he wedged himself between us on a king-size bed. The handover notes had warned us he could not be left alone, and they were right. For three weeks we shared a mattress with a dog built like a coffee table.
He is not on this list. That surprised us, since at the time he felt enormous. In fact he wasn’t close. The biggest dogs breeds start roughly where he stopped. The heaviest of them, the English Mastiff, reaches 230 pounds, about two and a half bed-hogging Weimaraners.
Below we rank 15 giant dog breeds from 15 up to 1, using breed-standard weight and shoulder height. Each entry gives the real exercise requirement, the grooming load, the health risks and an honest life expectancy. First, though, a word on why size and strength are not the same thing.
Big Is Not the Same as Strong
Size predicts mass, not power. Monty, a one-year-old Staffordshire Bull Terrier we sat on the Sunshine Coast, pulled harder on the lead than Cesar’s Siberian husky. He weighed maybe 16 kilos, though. Meanwhile the big Labrador we lived with for a month, twice Monty’s bulk, was heavy rather than powerful.
Cesar trained MMA and Brazilian jiu-jitsu for five years, so this was familiar. Smaller people beat bigger opponents constantly, because leverage and conditioning beat raw mass.
The research complicates that, though. A study found that bite force rises significantly with body size, and that skull shape matters in larger dogs. So a mastiff really does out-bite a Malinois. What doesn’t scale is stamina, acceleration or pulling power per kilo. Alaskan Malamutes prove it. At 75 to 85 pounds they were built for pulling sleds, and they out-haul far heavier dogs while needing hours of heavy exercise daily. Plenty of smaller breeds beat giants on raw output. We dug into that gap in our strongest dog breeds guide.
How We Ranked Them
We ordered this large dog breeds list by average weight, then shoulder height, using American Kennel Club standards. Giant dog breeds typically weigh over 90 to 100 pounds, so a few entries sit on that boundary. These figures describe healthy adults, not record-holders.
15. Bernese Mountain Dog
Bernese Mountain Dogs weigh 70 to 115 pounds and stand 23 to 27.5 inches tall. Swiss farmers originally bred them to drive cattle and pull carts, so these are draft animals with a house-pet temperament. The tricolour thick coat needs weekly brushing, and much more during shedding season. Exercise is modest at 30 to 60 minutes daily. However, the health record is sobering. Cancer rates run high, especially histiocytic sarcoma, and life expectancy sits near 7 to 8 years. Even so, their sweet temperament makes them fine family pets and one of the easier first giants.
14. Scottish Deerhound
The Scottish Deerhound stands 28 to 32 inches tall yet weighs only 75 to 110 pounds. That combination is the surprise: near Great Dane height at a third less mass. Highland hunters bred them to course red deer, which left a strong chase instinct that never switched off. Consequently a securely fenced yard is essential, and off-lead recall is optimistic. Meanwhile, the wiry coat sheds lightly. Scottish Deerhounds need about an hour of exercise each day, then sleep like the greyhounds in our greyhound guide. Bloat and bone cancer are the main worries; expect 8 to 11 years.
13. Cane Corso
The Cane Corso weighs 88 to 110 pounds and stands 23.5 to 27.5 inches tall. This italian mastiff descends from Roman working dogs and spent centuries on southern Italian farms as a guard dog. Grooming is easy thanks to the short coat. Training is not. Consistent training is essential for breeds like Cane Corso, and their protective nature means early socialization has to start in puppyhood. A protection dog that decides things for itself becomes a serious problem. Give it an hour of exercise plus real mental work. UK records put median survival at 8.1 years. Experienced owners only.
12. Dogue de Bordeaux
The Dogue de Bordeaux carries the largest head relative to body size of any dog breed. This french mastiff weighs 99 to 110 pounds and worked as a guardian and cart dog in south-west France. Grooming takes minutes; the drool takes towels. Crucially, that flat face brings breathing risk, so keep walks short, cool and around 30 to 45 minutes. Life expectancy is the harshest here at roughly 5 to 8 years. Ask your vet about airway assessment and heat management before you commit. Calm households suit them. Busy first-time pet owners generally do not.
11. Great Pyrenees
The Great Pyrenees is a sheep dog that weighs over 85 pounds and stands 25 to 32 inches tall. Shepherds developed the breed to protect livestock without human supervision, and that independence survives intact in suburbia. As a result, recall is unreliable and fence-testing becomes a hobby. The thick double coat needs weekly brushing and real commitment in shedding season. Nights bring the famous deep bark, which neighbours notice. Exercise runs 30 to 60 minutes, plus patrolling. Consistent socialization from puppyhood also softens their wariness around strangers and other dogs. Notably, they outlive most giants at 10 to 12 years. Our sheep dogs guide explains how guarding and herding differ.
10. Greater Swiss Mountain Dog
The Greater Swiss Mountain Dog weighs 85 to 140 pounds, noticeably heavier than its Bernese cousin. While female Bernese Mountain Dogs typically weigh 70 to 95 pounds and stand 23 to 26 inches tall, males are significantly larger, reaching up to 115 pounds and 27.5 inches.
This swiss mountain dog worked as a draft breed on alpine farms, hauling loads that ponies would otherwise carry. On top of that, the short double coat still sheds, so budget for weekly brushing. Forty-five to sixty minutes of daily walking keeps them content. Temperament is confident and friendly, although adolescents can flatten a toddler by accident. Watch for bloat, hip dysplasia and splenic torsion. Typical lifespan lands between 8 and 11 years.
9. Anatolian Shepherd Dog
The Anatolian Shepherd Dog reaches 27 to 29 inches tall and can weigh up to 150 pounds. Turkish herders bred this ancient breed to live with flocks and fight off wolves. That job description explains the temperament. For instance, Namibia’s Cheetah Conservation Fund places Anatolians with farmers for guarding livestock, which cuts predator killings without a rifle. That is conservation work done by a dog. In addition, the short coat sheds heavily twice a year. Give 45 to 60 minutes daily and a fence you trust. Life expectancy is a respectable 11 to 13 years. Not a first dog.
8. Tibetan Mastiff
The Tibetan Mastiff weighs 70 to 150 pounds and wears the heaviest mane on this list. A study showed why it copes at altitude. Tibetan Mastiffs picked up hypoxia-adapted EPAS1 variants by interbreeding with Tibetan gray wolves roughly 24,000 years ago. Few pets carry wolf genes that useful. The thick fur blows out once a year in spectacular fashion, so regular grooming is non-negotiable. Exercise needs are surprisingly modest at 30 to 60 minutes. Still, this aloof nocturnal guardian is a rare breed for good reason.
7. Newfoundland
Newfoundlands typically weigh 100 to 150 pounds and stand 26 to 28 inches tall. Fishermen bred them to haul nets and pull people from cold water. Hence the webbed feet and the oily, water-resistant double coat. Swimming is ideal exercise; otherwise 30 to 60 minutes of walking works. The “nanny dog” reputation deserves a caveat, though. Temperament depends on genetics, upbringing and training, not on breed folklore. Any dog this heavy needs supervision around small children. Ask your vet about subvalvular aortic stenosis and cystinuria. Expect 9 to 10 years, and expect drool on your ceiling.
6. Neapolitan Mastiff
The Neapolitan Mastiff weighs 110 to 150 pounds and looks poured into loose skin. Those folds and floppy ears are the maintenance job. They trap moisture and need cleaning, and the drooping eyelids bring their own problems. Roman guardians stand behind the breed, and the modern version remains a serious protection dog with a calm indoor setting. Exercise is light, around 30 minutes, since heat and joints both limit them. Life expectancy is short at 7 to 9 years. Above all, this is a breed for people who genuinely enjoy veterinary appointments.
5. Leonberger
Leonbergers weigh 90 to 170 pounds and stand up to 31.5 inches tall. A German mayor created the breed in the 1800s, reportedly to resemble the lion on his town’s crest. Both world wars nearly wiped it out. The coat is enormous and demands several brushing sessions a week. In practice, an hour of daily exercise is the baseline. Leonbergers are prone to joint problems and heart disease. Ekenstedt and colleagues (2014) also identified an ARHGEF10 deletion behind juvenile-onset polyneuropathy in Leonbergers and Saint Bernards. DNA tests exist, so ask breeders which ones they run. Lifespan is 7 to 9 years.
4. Irish Wolfhound
The Irish Wolfhound is the tallest dog breed, reaching heights of 30 to 32 inches. Weight is comparatively light at 105 to 120 pounds. Irish nobles bred it to hunt wolves and course deer, then kept it long after the wolves disappeared. By contrast, the rough coat needs only weekly brushing. Roughly an hour of exercise satisfies them, and they are famously calm indoors afterwards. Here is the brutal trade-off, though. Irish Wolfhounds have a lifespan of only 6 to 8 years, with heart disease and bone cancer prominent. The gentle nature is real. The time is not.
3. Great Dane
Great Danes stand 28 to 32 inches tall at the shoulder and weigh 110 to 175 pounds. German nobles originally bred them to hunt wild boar, which is hard to picture when one is asleep across your sofa. Grooming is trivial, and 30 to 60 minutes of daily walking is plenty. Consequently Great Danes handle apartment living better than most giant breeds. Bloat is the headline risk. Deep-chested breeds top every GDV study, and Glickman and colleagues (2000) flagged raised bowls and fast eating as risk factors to discuss with your vet. Life expectancy is 7 to 10 years.
2. Saint Bernard
Saint Bernards weigh 120 to 180 pounds and stand 26 to 30 inches tall. Monks at the Great St Bernard Pass used them for Alpine rescue work, though the brandy barrel is pure invention. Edwin Landseer painted it in 1820 and the myth stuck. Notably, coat length comes in two versions, smooth and rough, and both shed enthusiastically. Exercise is moderate at 30 to 60 minutes, ideally in cool weather. UK data puts median survival at 9.3 years. Between the heat sensitivity, the drool and the joint risk, this is a house-with-a-yard dog.
1. English Mastiff
The English Mastiff weighs between 120 and 230 pounds, making it the heaviest dog breed alive. Britain used mastiff types as war dogs, estate guards and, unhappily, as a fighting dog before the practice was outlawed. Even so, the modern temperament is famously placid. In short, grooming needs little beyond a weekly once-over. Exercise is light too, at 30 to 45 minutes. Giant breeds take longer to physically and mentally mature, so their joints deserve patience. UK records give a median lifespan of 9.0 years. Hip dysplasia, bloat and heart disease are the health problems to screen for.
Frequently Asked Questions
The Irish Wolfhound is the tallest breed by standard, with males standing at least 32 inches. Great Danes come close at 28 to 32 inches, and individual Danes hold the records for tallest living dog. In practice the two overlap constantly, so the tallest dog you meet may well be either.
Bernese Mountain Dogs, Newfoundlands and Great Danes are the most forgiving gentle giants for beginners, thanks to their gentle nature and tolerance of household chaos. By contrast, livestock guardians and mastiff-type protection breeds need experienced owners who stay consistent for years. Meeting adult dogs of the breed teaches you more than any article can.
Yes, several can, provided they get their daily walks and a bed big enough to sprawl on. Great Danes, English Mastiffs and Neapolitan Mastiffs are low-energy indoors and often cope well. Malamutes, Anatolians and Great Pyrenees do not, because they were bred to work outdoors and will invent a job if you don’t supply one.
The Real Trade-Off
Every dog here asks the same question in a different accent. How much life will you trade for how much dog? Giant breeds give you a decade at best, and often seven years. That is the cost of the size, and A study showed it is a real biological pattern rather than bad luck. Large dogs simply age faster.
Our Weimaraner taught us the cheap version of that lesson. Big dogs take up your bed, your budget and eventually your heart. Then they leave sooner than they should, and most dog lovers underestimate that arithmetic. If you are still weighing it up, go and stand beside an adult of the breed. After that, read our strongest dog breeds guide, since power and size rarely arrive in the same dog, and our Staffordshire Bull Terrier facts for the proof in 16 kilos.
Which giant would you actually live with? Tell us in the comments.
Guess That Giant! 🐕
A 15-photo guess-the-dog challenge — the wrong answers are deliberately tricky look-alikes from a similar group. Go back and change any answer before you score.
Which giant is this?
References:
Ekenstedt, K. J., Becker, D., Minor, K. M., Shelton, G. D., Patterson, E. E., Bley, T., Oevermann, A., Bilzer, T., Leeb, T., Drögemüller, C., & Mickelson, J. R. (2014). An ARHGEF10 deletion is highly associated with a juvenile-onset inherited polyneuropathy in Leonberger and Saint Bernard dogs. PLOS Genetics, 10(10), e1004635. https://doi.org/10.1371/journal.pgen.1004635
Glickman, L. T., Glickman, N. W., Schellenberg, D. B., Raghavan, M., & Lee, T. L. (2000). Non-dietary risk factors for gastric dilatation-volvulus in large and giant breed dogs. Journal of the American Veterinary Medical Association, 217(10), 1492–1499. https://avmajournals.avma.org/view/journals/javma/217/10/javma.2000.217.1492.xml
McMillan, K. M., Bielby, J., Williams, C. L., Upjohn, M. M., Casey, R. A., & Christley, R. M. (2024). Longevity of companion dog breeds: Those at risk from early death. Scientific Reports, 14, 531. https://doi.org/10.1038/s41598-023-50458-w
Miao, B., Wang, Z., & Li, Y. (2017). Genomic analysis reveals hypoxia adaptation in the Tibetan Mastiff by introgression of the gray wolf from the Tibetan Plateau. Molecular Biology and Evolution, 34(3), 734–743. https://doi.org/10.1093/molbev/msw274
Ellis, J. L., Thomason, J., Kebreab, E., Zubair, K., & France, J. (2009). Cranial dimensions and forces of biting in the domestic dog. Journal of Anatomy, 214(3), 362–373. https://doi.org/10.1111/j.1469-7580.2008.01042.x
