Largest Dog Breed in the World: Top 10 Giants Ranked by Size
Which is the largest dog breed in the world? We rank 10 giant breeds by height, weight, and temperament with a decision framework to help you choose.
If you've ever stood next to a dog whose head reached your waist, you know the magnetic pull of giant breeds. But searching for the largest dog breed in the world yields conflicting answers—some sources rank by height, others by weight, and a few by overall mass. The truth is, "largest" means different things depending on which metric you prioritize. A Great Dane towers over a Mastiff, but a Mastiff outweighs a Great Dane by 50+ pounds.
This guide cuts through the confusion. We evaluated 12 giant breeds using three standardized metrics—shoulder height, adult male weight, and body mass index (weight relative to frame)—then ranked the top 10 based on a composite score. Whether you're researching for adoption, curiosity, or planning the space and budget a giant dog requires, this breakdown gives you the exact numbers you need.
To make this ranking, a breed must meet all three thresholds:
- Minimum adult male weight: 100 lb (45 kg) or more at healthy body condition score (BCS 4-5/9)
- Minimum shoulder height: 25 inches (63.5 cm) or taller at the withers
- Recognized breed standard: Registered with at least one major kennel club (AKC, FCI, or UKC) with published size specifications
We sourced weight and height data from the American Kennel Club breed standards and cross-referenced with the Fédération Cynologique Internationale registry. Breeds like the Irish Wolfhound made the list on height alone; breeds like the Bullmastiff qualified on weight. Crossbreeds and non-standardized landrace dogs (e.g., Central Asian Shepherds without FCI papers) were excluded for data consistency.
The 10 Largest Dog Breeds in the World, Ranked
We ranked these breeds using a composite score: 40% weight, 35% height, 25% overall body mass impression (a qualitative assessment of bulk and bone structure). Here are the results, organized from #10 (smallest giant) to #1 (the undisputed largest).
Size class: Giant (Working Group) | Male weight: 110-170 lb (50-77 kg) | Male height: 28-31.5 in (71-80 cm)
The Leonberger is a German breed originally developed in the 1840s by crossing Saint Bernards, Newfoundlands, and Great Pyrenees. Males carry a distinctive lion-like mane. Despite their bulk, Leonbergers are notably agile swimmers and excel in water rescue work. Their gentle, family-oriented temperament makes them one of the most approachable giants on this list.
Ranking rationale: Solid mass and above-average height, but lighter bone structure than the top-ranked mastiff-type breeds keeps them at #10.
Size class: Giant (Working Group) | Male weight: 130-150 lb (59-68 kg) | Male height: 28 in (71 cm)
Known as nature's babysitter, the Newfoundland was bred for water rescue off the Canadian coast. Their webbed feet and water-resistant double coat are functional adaptations, not just aesthetics. Newfies are famously patient with children—so much so that the AKC describes them as "the patience of a saint" in breed literature. Expect heavy drool and a coat that sheds in clumps twice a year.
Ranking rationale: Dense, heavy-bodied build with substantial bone, but moderate height relative to other giants places them at #9.
Size class: Giant (Working Group) | Male weight: 80-115 lb (36-52 kg) | Male height: 25-27.5 in (64-70 cm)
The Berner qualifies on the lower end of our weight threshold but compensates with a stocky, heavily-boned frame that creates a substantial visual and physical presence. Originally a Swiss draft dog, they pulled carts loaded with cheese and supplies through Alpine passes. Their tricolor coat and sweet expression make them one of the most photogenic giants. A significant caveat: their lifespan averages only 6-8 years, one of the shortest of any AKC-recognized breed, largely due to high cancer rates (histiocytic sarcoma prevalence estimated at 25% in some lines).
Ranking rationale: Borderline weight qualification but exceptional body density and broad chest earn them a spot at #8.
Size class: Giant (Working Group) | Male weight: 100-160 lb (45-73 kg) | Male height: 27-32 in (69-81 cm)
The Great Pyrenees is a livestock guardian breed from the French-Spanish border mountains. They are independent thinkers—bred to make decisions without human direction—which translates to a dog that may ignore recall commands if it decides the perimeter needs patrolling. Their thick white double coat provides insulation down to sub-zero temperatures but requires weekly brushing and sheds profusely. Nighttime barking is common and can be a neighborhood issue.
Ranking rationale: Tall and heavy with a broad frame, but leaner build than mastiff types keeps them at #7.
Size class: Giant (Working Group) | Male weight: 90-150 lb (41-68 kg) | Male height: 26-30 in (66-76 cm)
One of the oldest guardian breeds, the Tibetan Mastiff has guarded Himalayan monasteries and nomadic camps for millennia. Their massive mane and heavy coat create an illusion of even greater size. This breed is notoriously independent, territorial, and not recommended for first-time owners. They tend to bond closely with one person and can be aloof or suspicious with strangers. Males often reach their full size only after 4-5 years—slower maturation than most breeds.
Ranking rationale: Heavy bone and substantial mass, but slightly shorter average height and leaner weight range than top competitors.
Size class: Giant (Working Group) | Male weight: 140-180 lb (64-82 kg) | Male height: 28-30 in (71-76 cm)
The Saint Bernard's association with Alpine rescue is well-documented—monks at the Great Saint Bernard Hospice in the Swiss Alps bred them for pathfinding and avalanche rescue beginning in the 1660s. Modern Saint Bernards retain their cold-weather endurance and gentle disposition. They are among the heaviest breeds on average, with many males exceeding 160 lb. Drool management is a real daily consideration—invest in drool rags and keep furniture covers handy. According to the Merck Veterinary Manual, hip dysplasia and gastric dilatation-volvulus (bloat) are the primary health concerns.
Ranking rationale: Exceptional weight and solid height place them firmly in the top 5, just below the heaviest mastiff types.
Size class: Giant (Hound Group) | Male weight: 120-180 lb (54-82 kg) | Male height: 32+ in (81+ cm)
If height is your primary metric, the Irish Wolfhound is arguably the tallest dog breed in the world—males must be a minimum of 32 inches at the shoulder per AKC standard, and many exceed 34 inches. Standing on hind legs, a large male can reach over 7 feet tall. Originally bred to hunt wolves and elk in medieval Ireland, they are sighthounds with surprising speed despite their size. Temperament-wise, they are gentle, quiet, and somewhat reserved. Their lifespan is tragically short—averaging 6-8 years—with cardiomyopathy and osteosarcoma as leading causes of death.
Ranking rationale: The tallest breed on the list by a significant margin, but leaner build (less overall mass than mastiffs) keeps them at #4.
Size class: Giant (Working Group) | Male weight: 150-200 lb (68-91 kg) | Male height: 26-31 in (66-79 cm)
The Neapolitan Mastiff (Mastino Napoletano) is a descendant of Roman war dogs and has guarded estates in southern Italy for centuries. Their most distinctive feature is the massive amount of loose skin and deep wrinkles covering the head and body—a trait selected for protection during fights with predators. They are intensely loyal, often following one owner from room to room, but can be aggressive toward unfamiliar dogs. Drool is extreme—this breed requires constant cleanup. They are not suited for hot climates due to their brachycephalic tendencies and heavy coat.
Ranking rationale: Among the heaviest breeds with enormous bone structure and body mass. Only slightly shorter average height than competitors keeps them at #3.
Size class: Giant (Working Group) | Male weight: 140-175 lb (64-79 kg) | Male height: 30-32 in (76-81 cm)
The Great Dane holds the current Guinness World Record for tallest living dog—Zeus, a Dane from Michigan, measured 3 ft 5.18 in (104.6 cm) at the withers before his death. Even average male Danes stand 30+ inches tall, making them the tallest breed on average when measured across the population. Despite their imposing stature, Danes are famously gentle—often described as "the world's biggest lap dog." They are generally friendly with strangers and other animals when properly socialized. Lifespan averages 7-10 years. Gastric dilatation-volvulus (bloat) is the leading cause of premature death; prophylactic gastropexy surgery (stomach tacking) is strongly recommended for all Danes, typically performed at the time of spay/neuter at a cost of $300-$800 additional.
Ranking rationale: Tallest breed on average and substantial weight, but slightly leaner frame than the English Mastiff keeps them at #2.
Size class: Giant (Working Group) | Male weight: 160-230 lb (73-104 kg) | Male height: 30+ in (76+ cm)
The English Mastiff is the largest dog breed in the world by overall mass. The heaviest recorded dog in history was an English Mastiff named Zorba, who weighed 343 lb (155.6 kg) in 1989—a record recognized by Guinness World Records. Modern males commonly reach 200+ lb at healthy body condition. They are broad, deep-chested, and heavily muscled, with a short fawn coat and distinctive black mask. Temperament is docile, calm, and deeply affectionate with family. They tend to be low-energy indoors and are content lounging for hours, though daily walks are necessary to maintain joint health and prevent obesity. Drool, snoring, and flatulence are daily realities of Mastiff ownership.
Ranking rationale: The heaviest breed on average by a wide margin, with substantial height and the greatest overall body mass of any recognized breed. The clear #1 by composite score.
Breed Comparison: All 10 Giants Side by Side
| Breed | Male Weight (lb/kg) | Male Height (in/cm) | Lifespan | Exercise Need | Family Fit |
|---|---|---|---|---|---|
| English Mastiff | 160-230 / 73-104 | 30+ / 76+ | 6-10 yr | 30-45 min/day | ★★★★☆ |
| Great Dane | 140-175 / 64-79 | 30-32 / 76-81 | 7-10 yr | 45-60 min/day | ★★★★★ |
| Neapolitan Mastiff | 150-200 / 68-91 | 26-31 / 66-79 | 7-9 yr | 30 min/day | ★★★☆☆ |
| Irish Wolfhound | 120-180 / 54-82 | 32+ / 81+ | 6-8 yr | 45-60 min/day | ★★★★☆ |
| Saint Bernard | 140-180 / 64-82 | 28-30 / 71-76 | 8-10 yr | 30-60 min/day | ★★★★★ |
| Tibetan Mastiff | 90-150 / 41-68 | 26-30 / 66-76 | 10-12 yr | 45 min/day | ★★☆☆☆ |
| Great Pyrenees | 100-160 / 45-73 | 27-32 / 69-81 | 10-12 yr | 30-45 min/day | ★★★★☆ |
| Bernese Mountain Dog | 80-115 / 36-52 | 25-27.5 / 64-70 | 6-8 yr | 30-60 min/day | ★★★★★ |
| Newfoundland | 130-150 / 59-68 | 28 / 71 | 9-10 yr | 30-60 min/day | ★★★★★ |
| Leonberger | 110-170 / 50-77 | 28-31.5 / 71-80 | 7-9 yr | 45-60 min/day | ★★★★☆ |
Ownership Costs: What Giant Breeds Really Cost
Giant breeds are the most expensive dogs to own across every cost category. Before committing to any breed on this list, understand the real numbers:
| Expense Category | Small Dog (20 lb) | Giant Breed (150 lb+) |
|---|---|---|
| Monthly food (premium kibble) | $35-$50 | $100-$180 |
| Heartworm preventive (monthly) | $8-$12 | $18-$25 |
| Annual wellness exam + vaccines | $200-$350 | $300-$500 |
| Emergency surgery (e.g., bloat/GDV) | $3,000-$5,000 | $5,000-$8,000 |
| Crate (appropriate size) | $40-$70 | $120-$250 |
| Pet insurance (annual premium) | $400-$600 | $700-$1,200 |
First-year costs for a giant breed puppy from a responsible breeder typically range from $4,500 to $8,000 when you combine the purchase price ($1,500-$3,500 for most breeds on this list, though Tibetan Mastiffs can exceed $5,000), initial veterinary care, supplies, and food. Annual ongoing costs after year one run $2,500-$4,500 depending on your region and the dog's health.
Honorable Mentions and Breeds That Didn't Make the Cut
Several breeds came close but didn't meet our composite criteria:
- Dogue de Bordeaux (French Mastiff): Males weigh 110-140 lb with a massive head and broad chest, but average height of 23-27 inches falls just below our 25-inch minimum for several individuals. An incredibly powerful breed with a loyal but stubborn temperament.
- Bullmastiff: At 110-130 lb for males, they are heavy and solidly built, but height (25-27 in) puts them at the lower boundary. Excellent guard dogs with moderate energy. They were originally bred by English gamekeepers to silently track poachers.
- Cane Corso: Males reach 100-120 lb and 25-27.5 inches—technically qualifying on our thresholds. However, their leaner, athletic build gives them less overall mass than the breeds ranked above. They excel as protection and working dogs but require experienced handlers.
- Anatolian Shepherd: A Turkish livestock guardian that can reach 150 lb and 29+ inches. Excluded because many lines are not standardized through AKC/FCI, making size data inconsistent across populations.
Decision Framework: Which Giant Breed Fits Your Life?
If you've narrowed your interest to the top three—the English Mastiff, Great Dane, or Neapolitan Mastiff—use this framework to choose based on your actual living situation.
- Apartment or condo (under 1,200 sq ft): Consider a Great Dane. Despite their height, Danes are surprisingly low-energy indoors and are known as "couch potatoes." They need daily walks but don't require a yard. Mastiffs and Neapolitans need more floor space to move comfortably.
- House with fenced yard (any size): All three breeds work. English Mastiffs and Neapolitan Mastiffs appreciate a yard for short patrols but are not high-exercise dogs.
- Rural property with acreage: Any breed works, but consider a Great Pyrenees or Tibetan Mastiff if you also want livestock guardian instincts.
- First-time dog owner: Great Dane or English Mastiff. Both are generally eager to please and respond well to positive reinforcement training. Avoid Neapolitan Mastiffs—they require firm, experienced handling and early, extensive socialization to prevent overprotective behavior.
- Experienced owner with guardian breed history: Any of the three, including Neapolitan Mastiff, Tibetan Mastiff, or Great Pyrenees.
- Children under 8: Great Dane or Newfoundland. Both are famously gentle and tolerant. English Mastiffs are gentle but their sheer weight (200+ lb) can accidentally knock over small children. Neapolitan Mastiffs are not recommended for homes with young children due to protective instincts and unpredictable reactions to chaotic play.
- Multi-pet household: Great Dane or Leonberger tend to coexist well with other dogs and even cats when raised together. Neapolitan Mastiffs and Tibetan Mastiffs may show same-sex aggression toward other dogs.
- Low tolerance for mess: None of these breeds are truly low-mess, but the Great Dane (short coat, moderate drool) is the cleanest option. Avoid Saint Bernards, Newfoundlands, and Neapolitan Mastiffs if drool bothers you.
- Don't mind daily cleanup: Any breed on this list. Budget for weekly grooming sessions and keep enzymatic cleaners on hand.
Health Considerations for Giant Breeds
Owning a giant breed requires proactive veterinary planning. These dogs face health risks that smaller breeds rarely encounter:
- Gastric Dilatation-Volvulus (GDV/bloat): The #1 emergency risk for deep-chested giants. The stomach fills with gas and can twist, cutting off blood supply. Without emergency surgery within 1-2 hours, GDV is fatal. Preventive gastropexy (stomach tacking) costs $300-$800 when performed during spay/neuter and reduces GDV risk by over 90%. Feed 2-3 smaller meals per day rather than one large meal, and avoid vigorous exercise for 1 hour before and after eating.
- Hip and elbow dysplasia: Prevalent in nearly all giant breeds. The Orthopedic Foundation for Animals (OFA) maintains a database of hip scores—always ask breeders for OFA-certified hip and elbow scores on both parents. Moderate exercise during puppyhood (no forced running or jumping until growth plates close at 18-24 months) helps protect developing joints.
- Cardiomyopathy: Dilated cardiomyopathy (DCM) is common in Great Danes, Irish Wolfhounds, and Saint Bernards. Annual cardiac screening via echocardiogram is recommended starting at age 2-3. Consult your veterinarian about taurine supplementation and grain-free diet concerns, as the FDA has investigated a potential link between certain grain-free diets and DCM.
- Osteosarcoma: Bone cancer disproportionately affects giant breeds, particularly Irish Wolfhounds, Great Danes, and Rottweilers. Limb amputation followed by chemotherapy offers a median survival time of 10-12 months, though some dogs live longer with early detection.
When to Call the Vet Immediately: If your giant breed dog shows a distended abdomen, unproductive retching (trying to vomit but nothing comes up), restlessness, pale gums, or collapse—go to the nearest emergency veterinary hospital immediately. These are signs of GDV/bloat, and every minute counts.
Frequently Asked Questions
What is the single largest dog breed in the world?
By overall mass, the English Mastiff is the largest dog breed in the world, with males averaging 160-230 lb (73-104 kg). By height, the Great Dane and Irish Wolfhound compete for tallest, with Great Danes holding the current Guinness record. Your answer depends on whether you define "largest" by weight, height, or total body volume.
Are giant dog breeds good with children?
Several giant breeds—particularly Great Danes, Newfoundlands, Saint Bernards, and Bernese Mountain Dogs—are renowned for their patience and gentleness with children. However, any dog weighing 150+ lb can accidentally injure a toddler simply by leaning, stepping, or wagging its tail. Always supervise interactions between giant dogs and children under 8, and teach children not to climb on or startle the dog.
How much does it cost to feed a giant breed dog?
Expect to spend $100-$180 per month on premium kibble for a 150+ lb dog eating 6-10 cups daily. Brands formulated for giant breeds (such as Royal Canin Giant, Purina Pro Plan Large Breed, or Hill's Science Diet Large Breed) include adjusted calcium-phosphorus ratios critical for proper bone development in puppies and joint support in adults.
Can giant breeds live in apartments?
Some can—Great Danes, in particular, adapt surprisingly well to apartment life because they are low-energy indoors. However, you'll need space for an extra-large crate (48-54 inches, $120-$250), and building management may have weight restrictions. Check your lease agreement before committing. English Mastiffs can also adapt to apartments if given daily walks, but their size makes navigating stairs and tight hallways challenging.
What is the lifespan of giant dog breeds?
Giant breeds have the shortest lifespans of any dog size category. Most live 6-10 years, with the English Mastiff, Irish Wolfhound, and Bernese Mountain Dog on the lower end (6-8 years average) and the Great Pyrenees and Tibetan Mastiff on the higher end (10-12 years). The biological reason relates to accelerated growth rates and increased oxidative stress in large bodies, though the exact mechanisms are still being studied.
Where should I get a giant breed puppy?
Work with a responsible breeder who performs OFA hip/elbow scoring, cardiac screening, and breed-specific genetic testing (e.g., DCM panel for Great Danes, degenerative myelopathy for Bernese Mountain Dogs). Expect to pay $1,500-$3,500 for a well-bred puppy, with a waiting list of 3-12 months. Giant breed rescue organizations—such as Mastiff Club of America Rescue or Great Dane Rescue—also place adult dogs in need of homes, often at adoption fees of $300-$600. Both routes are valid paths to a wonderful companion.
Marcus Aldridge
All our authors care for dogs every day — read more of their work on the authors page.
