The 10 Largest Dog Breeds: Size, Temperament & Care Guide
The 10 largest dog breeds ranked by height & weight. Includes breed comparisons, care costs, health risks, & a decision framework for choosing the right...
What Qualifies a Dog as One of the Largest Breeds?
When we talk about the largest dog breeds, we're not just measuring height at the shoulder. True "giant" status in the canine world involves a combination of factors that impact how these dogs live, eat, and fit into a household. Before we rank the breeds, here's the framework used to build this list.
Selection Criteria for This List
- Minimum adult male weight: 90 lb (41 kg) or more at maturity (24–36 months)
- Minimum adult male height: 25 inches (63.5 cm) at the withers per AKC breed standards
- Recognized breed status: Must be fully recognized by the AKC or FCI (no experimental crosses)
- Documented health data: Sufficient veterinary literature exists on breed-specific conditions
- Availability: Breed is obtainable through responsible breeders or rescue in the United States
Weight and height ranges below reflect adult males. Females are typically 10–20% smaller. All measurements sourced from AKC breed standards and the Merck Veterinary Manual.
Dogs on this list are grouped into three tiers: Super Giants (over 140 lb / 64 kg), Standard Giants (100–140 lb / 45–64 kg), and Tall Giants (dogs that qualify primarily on height rather than mass). This grouping helps prospective owners understand the practical differences between a mastiff-type dog built for bulk and a sighthound-type dog built for height and stride.
The 10 Largest Dog Breeds Ranked
The following breeds are ordered by a composite score of average adult male weight and height, with mass weighted slightly heavier since it has more impact on daily care costs, space requirements, and health management. Each entry includes why the breed earned its place on this list.
1. English Mastiff — The Heavyweight Champion
Size Class: Super Giant | Weight: 160–230 lb (73–104 kg) | Height: 30+ in (76+ cm)
Key Trait: Heaviest breed by average body mass; holds the world record for heaviest dog (Zorba, 343 lb / 155.6 kg in 1989)
The English Mastiff is the undisputed heavyweight of the dog world. Males routinely exceed 200 lb (91 kg), and their massive bone structure means they occupy significant physical space even when lying still. Despite their imposing appearance, Mastiffs are famously low-energy couch companions. Their ranking at #1 reflects pure mass — no other breed consistently reaches these weights while maintaining breed health.
Why it's on this list: Highest average adult weight of any AKC-recognized breed. A 2020 study in the Journal of Veterinary Internal Medicine noted Mastiffs have a median lifespan of 6–10 years, heavily influenced by size-related cardiac and orthopedic conditions.
2. Saint Bernard — The Alpine Giant
Size Class: Super Giant | Weight: 140–180 lb (64–82 kg) | Height: 28–30 in (71–76 cm)
Key Trait: Combines extreme mass with a dense double coat evolved for Swiss Alpine rescue work
Saint Bernards carry their weight differently than Mastiffs — they're more athletic and proportionally taller, with powerful hindquarters built for navigating deep snow. Originally bred by monks at the Great Saint Bernard Hospice in the Swiss Alps for search-and-rescue, they retain a calm, steady temperament. Males frequently reach 170 lb (77 kg) and stand 30 inches at the shoulder.
Why it's on this list: Second-heaviest breed on average and one of the few super giants with a genuine working-dog heritage that shapes their exercise needs and trainability.
3. Boerboel — The South African Powerhouse
Size Class: Super Giant | Weight: 150–200 lb (68–91 kg) | Height: 24–28 in (61–71 cm)
Key Trait: Densest muscle-to-frame ratio among giant breeds; originally bred to guard South African homesteads against predators
The Boerboel (pronounced "boor-bull") is a mastiff-type dog developed in South Africa from crosses of European mastiffs brought by Dutch, French, and English settlers. They're more athletic and driven than English Mastiffs, requiring confident owners who understand canine body language and positive reinforcement training. Their compact power makes them appear shorter than they are — males stand up to 28 inches but carry extraordinary muscle density.
Why it's on this list: AKC recognized in 2015, the Boerboel fills a unique niche as a super giant with genuine guardian instincts and higher energy than most breeds in this weight class. Note: Boerboels are subject to breed-specific legislation in some jurisdictions — check local laws before acquiring one.
4. Great Dane — The Tallest Breed
Size Class: Tall Giant | Weight: 140–175 lb (64–79 kg) | Height: 30–32 in (76–81 cm)
Key Trait: Tallest breed by shoulder height; holds the current record for tallest living dog
Great Danes are the skyscrapers of the dog world. While they weigh less than Mastiffs or Boerboels, their leggy build and 32-inch shoulder height give them a towering presence. A Great Dane standing on hind legs can look an adult human in the eye. Originally bred in Germany to hunt wild boar, modern Danes are gentle, people-oriented dogs that often think they're lapdogs.
Why it's on this list: Unmatched height. Zeus, a Great Dane, held the Guinness World Record at 44 inches (111.8 cm) at the shoulder. Their height creates unique considerations — elevated feeding stations, oversized vehicles for transport, and doorframe clearance in smaller homes.
5. Leonberger — The Gentle Lion
Size Class: Standard Giant | Weight: 110–170 lb (50–77 kg) | Height: 28–31.5 in (71–80 cm)
Key Trait: Largest of the European working/guardian breeds with a water-resistant double coat and webbed feet
Bred in the 1840s in Leonberg, Germany, by crossing Saint Bernards, Newfoundlands, and Great Pyrenees, the Leonberger was designed to look like the lion on the town's crest. They're versatile workers — used in water rescue, cart-pulling, and as family guardians. Males carry a distinctive mane-like ruff and can reach 170 lb (77 kg).
Why it's on this list: Unique combination of giant size with genuine multi-sport capability. Leonbergers compete in carting, water rescue, and agility (yes, giant-breed agility — with modified equipment). They bridge the gap between a traditional mastiff and a working retriever.
6. Neapolitan Mastiff — The Wrinkled Guardian
Size Class: Super Giant | Weight: 150 lb (68 kg) minimum, often 160–180 lb (73–82 kg) | Height: 26–31 in (66–79 cm)
Key Trait: Most extreme loose skin and wrinkle formation of any breed — a deliberate selection for predator defense
The Neapolitan Mastiff descends from ancient Roman war dogs and was refined in southern Italy as an estate guardian. Their extraordinary loose skin and heavy wrinkles served a functional purpose: an attacker (animal or human) grabbing the skin couldn't reach vital tissue. Modern Neos are deeply loyal, calm indoors, and intensely bonded to their families. They drool — significantly — and require owners comfortable with that reality.
Why it's on this list: Combines extreme mass with a unique physical adaptation (loose skin) not seen in other giant breeds. Their guarding heritage means early socialization using positive reinforcement methods is non-negotiable.
7. Newfoundland — The Water Rescue Giant
Size Class: Standard Giant | Weight: 130–150 lb (59–68 kg) | Height: 28 in (71 cm)
Key Trait: Natural swimming ability with a water-resistant double coat, webbed feet, and a documented instinct to rescue drowning humans
Newfoundlands were bred by fishermen in Newfoundland, Canada, to haul nets, pull carts, and rescue people from cold Atlantic waters. Their swimming ability is legendary — they use a modified breaststroke and have been documented swimming miles in open ocean. On land, they're famously gentle with children, earning the nickname "nanny dog" in Victorian England.
Why it's on this list: One of the few giant breeds with a documented life-saving working function. Their combination of size, swimming ability, and temperament is unique. Newfoundlands regularly earn AKC titles in water rescue and carting.
8. Irish Wolfhound — The Tallest Sighthound
Size Class: Tall Giant | Weight: 120 lb (54 kg) minimum | Height: 32+ in (81+ cm)
Key Trait: Tallest of all sighthounds; ancient Celtic breed originally used to hunt wolves and elk
The Irish Wolfhound is the tallest breed when measured at the shoulder, often exceeding the Great Dane in height (though not in combined height-plus-mass). Males must be at least 32 inches per AKC standard, and many reach 34–35 inches. Despite their size, they're sighthounds — built for speed and coursing, not brute force. Their rough coat and lean build give them an elegant, almost aristocratic appearance.
Why it's on this list: Holds the height record among sighthounds and combines it with a gentle, somewhat aloof temperament. Their ancient lineage (documented as early as 391 AD in Roman records) makes them one of the oldest giant breeds still in existence.
9. Tibetan Mastiff — The Himalayan Sentinel
Size Class: Standard Giant | Weight: 90–150 lb (41–68 kg) | Height: 26+ in (66+ cm)
Key Trait: Thickest coat of any giant breed — evolved for survival at 16,000+ ft elevation in the Himalayas
Tibetan Mastiffs guarded Buddhist monasteries and nomadic camps in the Himalayas for thousands of years. Their massive double coat, heavily plumed tail, and lion-like mane make them appear even larger than their actual measurements. They're independent thinkers — a trait essential for a breed that historically made its own decisions while guarding flocks against snow leopards and wolves. Males in Western show lines often reach 140–150 lb (64–68 kg).
Why it's on this list: Unique cold-weather adaptation among giant breeds. Their coat alone can weigh 5–8 lb (2–4 kg) when fully grown out. They also have one of the longest seasonal shedding events of any breed — a single blow-coat can fill multiple garbage bags.
10. Dogue de Bordeaux — The French Mastiff
Size Class: Standard Giant | Weight: 110–145 lb (50–66 kg) | Height: 23.5–27 in (60–69 cm)
Key Trait: Largest head-to-body ratio of any breed — skull circumference approaches the dog's height at the withers
The Dogue de Bordeaux is France's oldest breed, with origins predating the country itself (the "dogue" type was documented in the 14th century). They're stockier and lower to the ground than other giants on this list, but their massive heads and broad chests give them extraordinary physical presence. Their short, fine fawn coat and distinctive wrinkled face make them instantly recognizable.
Why it's on this list: Qualifies on mass and head size despite being slightly shorter than some breeds on this list. Their brachycephalic (short-faced) structure creates unique health considerations that prospective owners must understand, including brachycephalic obstructive airway syndrome (BOAS).
Breed Comparison: How the Largest Dog Breeds Stack Up
The table below compares all 10 breeds across the attributes that matter most for daily life with a giant dog. Data reflects adult males at maturity (typically 24–36 months for giant breeds).
| Breed | Weight (lb/kg) | Height (in/cm) | Lifespan | Exercise (min/day) | Annual Food Cost |
|---|---|---|---|---|---|
| English Mastiff | 160–230 / 73–104 | 30+ / 76+ | 6–10 yrs | 30–45 | $1,800–$2,800 |
| Saint Bernard | 140–180 / 64–82 | 28–30 / 71–76 | 8–10 yrs | 45–60 | $1,500–$2,400 |
| Boerboel | 150–200 / 68–91 | 24–28 / 61–71 | 9–11 yrs | 60–90 | $1,600–$2,600 |
| Great Dane | 140–175 / 64–79 | 30–32 / 76–81 | 7–10 yrs | 45–60 | $1,400–$2,200 |
| Leonberger | 110–170 / 50–77 | 28–31.5 / 71–80 | 7–9 yrs | 60–90 | $1,300–$2,200 |
| Neapolitan Mastiff | 150–180 / 68–82 | 26–31 / 66–79 | 7–9 yrs | 30–45 | $1,600–$2,400 |
| Newfoundland | 130–150 / 59–68 | 28 / 71 | 9–10 yrs | 45–60 | $1,300–$2,000 |
| Irish Wolfhound | 120+ / 54+ | 32+ / 81+ | 6–8 yrs | 45–60 | $1,200–$2,000 |
| Tibetan Mastiff | 90–150 / 41–68 | 26+ / 66+ | 10–12 yrs | 30–45 | $1,000–$1,800 |
| Dogue de Bordeaux | 110–145 / 50–66 | 23.5–27 / 60–69 | 5–8 yrs | 30–45 | $1,100–$1,800 |
Food costs calculated based on premium large-breed kibble at $1.50–$2.50/lb and average caloric needs for a sedentary-to-moderately-active adult. Active working dogs may require 30–50% more. Source: AKC Nutrition Guidelines.
Health Considerations Unique to Giant Breeds
Owning one of the largest dog breeds means accepting certain veterinary realities. Giant dogs face health challenges that smaller breeds rarely encounter, and the financial impact is significant.
Cardiac Disease
Dilated cardiomyopathy (DCM) disproportionately affects giant breeds, particularly Great Danes, Irish Wolfhounds, and Newfoundlands. The heart muscle thins and the chambers enlarge, reducing pumping efficiency. Screening via echocardiogram is recommended annually starting at age 3 for predisposed breeds. Cost: $300–$600 per screening.
Gastric Dilatation-Volvulus (GDV / Bloat)
GDV is a life-threatening emergency where the stomach fills with gas and twists on itself. Giant, deep-chested breeds are at highest risk. A prophylactic gastropexy (surgically tacking the stomach to the abdominal wall) performed during spay/neuter costs $300–$800 and reduces GDV risk by over 80%. Emergency GDV surgery, by contrast, costs $3,000–$7,000 with a mortality rate of 15–30% even with treatment.
Orthopedic Conditions
Hip dysplasia, elbow dysplasia, and osteosarcoma (bone cancer) are significantly more common in giant breeds. The Orthopedic Foundation for Animals (OFA) maintains breed-specific dysplasia rates — prospective buyers should verify that both parents have OFA-certified hip and elbow scores. Irish Wolfhounds have an osteosarcoma rate estimated at 12–15%, compared to roughly 2.5% across all breeds.
Emergency Red Flags in Giant Breeds
Seek immediate veterinary care if your giant-breed dog shows:
- Distended, hard abdomen with unproductive retching (possible GDV — this is a minutes-matter emergency)
- Sudden rear-leg weakness or collapse (possible spinal issue or cardiac event)
- Pale or blue-tinged gums with rapid breathing (possible cardiac failure or internal bleeding)
- Acute lameness in a single limb with swelling (possible osteosarcoma — requires same-day imaging)
How to Choose the Right Giant Breed for Your Lifestyle
The "best" largest dog breed depends entirely on your living situation, experience level, and what you want from a canine companion. Use this decision framework to narrow your options.
Giant Breed Decision Framework
Step 1: Assess your space.
- Apartment or small home with no yard? → Consider English Mastiff or Dogue de Bordeaux (surprisingly low indoor energy). Avoid Boerboel and Leonberger.
- House with fenced yard (minimum 6 ft fence)? → All breeds on this list are viable.
- Rural property with acreage? → Tibetan Mastiff, Irish Wolfhound, and Leonberger thrive with space to patrol and run.
Step 2: Assess your experience level.
- First-time dog owner? → Newfoundland, Great Dane, or Leonberger. These breeds are forgiving of training mistakes and highly food-motivated, making positive reinforcement training straightforward.
- Experienced owner with guardian-breed knowledge? → Boerboel, Neapolitan Mastiff, or Tibetan Mastiff are viable with proper socialization.
- Professional trainer or working-dog handler? → Any breed, but Boerboel and Tibetan Mastiff benefit most from experienced guidance.
Step 3: Assess your climate.
- Hot climate (regular temps over 85°F / 29°C)? → Dogue de Bordeaux, Great Dane, or Neapolitan Mastiff (short coats dissipate heat better). Avoid Newfoundland, Tibetan Mastiff, and Leonberger — their double coats make heatstroke a serious risk. All brachycephalic breeds (Dogue de Bordeaux) need climate-controlled environments regardless.
- Cold climate (regular temps below 32°F / 0°C)? → Newfoundland, Tibetan Mastiff, Leonberger, and Saint Bernard are in their element.
Step 4: Assess your budget.
- Annual budget under $4,000 (food + routine vet + insurance)? → Tibetan Mastiff (longest lifespan, lowest food cost) or Dogue de Bordeaux.
- Annual budget $4,000–$6,000? → Newfoundland, Saint Bernard, or Irish Wolfhound.
- Annual budget over $6,000? → Any breed, including English Mastiff and Boerboel (highest food and insurance costs).
The Real Cost of Owning a Giant Breed
Prospective owners often underestimate the financial commitment. Here's a realistic first-year and ongoing annual budget for a typical giant breed (using a 150 lb / 68 kg dog as baseline).
| Expense Category | First Year | Annual (Years 2+) |
|---|---|---|
| Purchase price (responsible breeder) | $2,000–$5,000 | — |
| Premium large-breed food | $1,400–$2,600 | $1,400–$2,600 |
| Pet insurance (giant-breed premium) | $1,200–$2,400 | $1,200–$2,400 |
| Heartworm/flea/tick prevention | $400–$700 | $400–$700 |
| Routine veterinary (exams, bloodwork) | $600–$1,200 | $400–$900 |
| Orthopedic screening (OFA x-rays) | $400–$700 | — |
| Giant-breed gear (XL crate, raised feeder, harness) | $400–$800 | $100–$200 |
| Total Estimated | $6,400–$13,400 | $3,500–$6,800 |
Insurance premiums for giant breeds are 40–80% higher than for medium breeds due to predisposition to expensive orthopedic and cardiac conditions. Some insurers cap payouts for breeds with expected lifespans under 8 years. Always read policy exclusions carefully.
Honorable Mentions & Breeds Often Mistaken for Giants
Several breeds are frequently assumed to be among the largest dog breeds but don't quite meet the criteria for this list — or they carry specific considerations worth understanding.
Honorable Mentions (Just Missed the List)
- Caucasian Shepherd (Ovcharka): Weighs 110–200 lb (50–91 kg) and stands 26–30 in. Not AKC-recognized (FCI-recognized), which limits availability and veterinary data in the US. Extremely independent and protective — not recommended for inexperienced owners.
- Cane Corso: Weighs 99–110 lb (45–50 kg) per AKC standard. While powerfully built, most males fall below the 90 lb minimum threshold for the lower weight range, and their height (25–27.5 in) barely qualifies. They're better classified as a large breed rather than a giant breed.
- Anatolian Shepherd: Weighs 110–150 lb (50–68 kg) and stands 29+ in. A legitimate giant by measurements, but their intense livestock-guardian instincts and low sociability with strangers make them unsuitable for most households. Best suited for working ranch environments.
- Great Pyrenees: Weighs 100–160 lb (45–73 kg). Qualifies on weight but is lighter-boned than most breeds on this list. Their fluffy coat creates an illusion of greater mass.
Breeds to Approach With Caution
Some "giant" breeds carry health or temperament concerns that warrant extra diligence:
- Dogue de Bordeaux: Shortest lifespan on this list (5–8 years). Brachycephalic airway issues, cardiac disease, and cancer rates are significantly above average. Owners should budget for higher end-of-life veterinary costs and be prepared for a shorter time with their dog.
- Irish Wolfhound: Lifespan of only 6–8 years with high osteosarcoma and cardiac disease rates. Emotionally devastating for owners who aren't prepared for the brevity of the relationship.
- "Rare" or "designer" giant crosses: Crosses marketed as "King Shepherds," "Shiloh Shepherds," or "American Bandogges" lack standardized health testing and breed predictability. If you want a giant breed, choose one with established health registries and OFA data.
Frequently Asked Questions About the Largest Dog Breeds
What is the single largest dog breed in the world?
By average weight, the English Mastiff is the largest breed, with males averaging 160–230 lb (73–104 kg). By height, the Great Dane and Irish Wolfhound compete for tallest, with both breeds regularly exceeding 32 inches (81 cm) at the shoulder. The answer depends on whether you define "largest" by mass, height, or overall body volume.
Are giant dog breeds good with children?
Several giant breeds — particularly Newfoundlands, Saint Bernards, and Leonbergers — are renowned for their patience and gentleness with children. However, any dog weighing over 100 lb can accidentally injure a small child simply by bumping into them or lying down on them. Supervision is always essential, and children should be taught to respect the dog's space, especially during meals and sleep. Use positive reinforcement to train both the dog and the children on appropriate interactions.
How much exercise do the largest dog breeds need?
Contrary to popular belief, most giant breeds are moderate-to-low energy. Mastiff-type dogs (English Mastiff, Neapolitan Mastiff, Dogue de Bordeaux) typically need only 30–45 minutes of daily walking. More athletic giants like the Leonberger, Boerboel, and Newfoundland benefit from 60–90 minutes of activity. Avoid forced exercise (long runs, jumping) in dogs under 18–24 months, as their growth plates haven't closed and repetitive impact can damage developing joints.
Do giant breeds eat significantly more than large breeds?
Yes. A 180 lb English Mastiff requires roughly 3,500–4,500 calories per day for maintenance, compared to 1,500–1,800 calories for a 70 lb Labrador Retriever. This translates to 6–10 cups of premium kibble daily, or approximately $5–$8 per day in food costs alone. Giant breeds should be fed a diet specifically formulated for large/giant breeds, with controlled calcium and phosphorus ratios to support proper bone development. Look for the AAFCO statement confirming the food meets nutritional requirements for large-breed growth.
What size crate does a giant breed need?
Most giant breeds require a 54-inch (137 cm) extra-large crate. Brands like MidWest Homes for Pets (model 1154U) and ProSelect Empire offer crates rated for dogs up to 200+ lb. Expect to spend $150–$400 for a quality giant-breed crate. The dog should be able to stand fully upright, turn around, and lie stretched out. For puppies, use a divider panel to section off a smaller area and expand as they grow.
Should I get pet insurance for a giant breed?
Yes — giant breeds are among the strongest candidates for pet insurance due to their predisposition to expensive conditions (GDV surgery: $3,000–$7,000; hip replacement: $5,000–$8,000 per hip; cardiac treatment: $1,000–$5,000+). Enroll before any conditions manifest, as pre-existing conditions are universally excluded. Compare providers like Trupanion, Healthy Paws, and Nationwide, paying close attention to annual payout caps, per-incident limits, and breed-specific exclusions.
Which giant breed lives the longest?
The Tibetan Mastiff has the longest average lifespan among the breeds on this list at 10–12 years, likely due to its relatively moderate size (compared to Mastiffs) and genetic diversity from its isolated Himalayan origins. Among the heavier giants, the Boerboel (9–11 years) and Newfoundland (9–10 years) also outperform the breed average for dogs of their size.
Veterinary Disclaimer: This article provides general breed information and should not replace professional veterinary advice. Giant breeds have unique health considerations that require individualized care plans. Always consult your veterinarian before making decisions about diet, exercise, preventive care, or medical treatment for your dog.
Beth Carrasco
All our authors care for dogs every day — read more of their work on the authors page.
