Biggest Dog Breed Guide: 10 Giant Breeds Ranked by Size, Cost & Care
Discover the biggest dog breeds ranked by weight, height, lifespan, and annual care costs.
If you've ever stood next to a Great Dane and felt like you were looking up at a small horse, you already understand the appeal of giant breeds. But searching for the biggest dog breed isn't just about finding the tallest or heaviest — it's about understanding which giant breed actually fits your home, budget, and lifestyle. After years of helping owners navigate the realities of living with dogs that weigh more than some adults, I've put together this ranked guide with the specific numbers, costs, and care requirements you won't find in generic breed lists.
How We Ranked These Breeds
To qualify for this list, a breed must meet all three of the following criteria based on AKC breed standards:
- Minimum male weight: 100 lb (45 kg) or more at maturity
- Minimum male height: 25 inches (63.5 cm) at the shoulder
- Recognized breed status: Full AKC or FCI recognition (no experimental crosses)
Breeds are ranked using a composite score across five factors: average male weight (30%), average height (20%), annual care cost (20%), lifespan-adjusted lifetime cost (15%), and family adaptability (15%). Weight and height data come from official breed standards; cost estimates reflect 2026 U.S. veterinary and supply pricing.
The 10 Biggest Dog Breeds, Ranked
1. English Mastiff — The Heaviest Breed on Earth
Size Class: Super Giant | Key Trait: Highest average weight of any recognized breed
The English Mastiff claims the top spot not for height but for sheer mass. Males typically weigh 160–230 lb (73–104 kg), with some individuals exceeding 250 lb (113 kg). The AKC records the breed standard at a minimum of 160 lb for males. Despite their imposing size, Mastiffs are famously calm indoors — often called "the ultimate couch dog." They need only 30–45 minutes of moderate daily exercise, making them surprisingly apartment-compatible if space allows for their footprint. Their short coat sheds moderately year-round and requires weekly brushing.
Why it made the list: No other breed consistently reaches the English Mastiff's weight range. A recorded Mastiff named Zorba held the Guinness record at 343 lb (155 kg).
2. Great Dane — The Tallest Breed Recognized
Size Class: Super Giant | Key Trait: Greatest shoulder height of any breed
Great Danes stand 30–32 inches (76–81 cm) at the shoulder for males, with some reaching 34 inches. Weight ranges from 140–175 lb (64–79 kg). They're more athletic than Mastiffs and need 60–90 minutes of daily exercise. Danes are known for their gentle, people-oriented temperament — they often don't realize how large they are and will attempt to sit on laps. Their single coat is very low-maintenance. According to the AKC Great Dane standard, the breed should convey power and elegance in equal measure.
Why it made the list: The tallest breed by shoulder height. Zeus, a Great Dane, held the record at 44 inches (112 cm) tall.
3. Saint Bernard — The Alpine Giant
Size Class: Giant | Key Trait: Heaviest working breed originally bred for alpine rescue
Saint Bernard males weigh 140–180 lb (64–82 kg) and stand 28–30 inches (71–76 cm). Originally bred by monks at the Great St. Bernard Hospice in the Swiss Alps for search and rescue, they retain a calm, watchful temperament. They come in short-haired and long-haired varieties. Drooling is significant — owners should budget for drool rags as a genuine supply cost. Exercise needs are moderate at 45–60 minutes daily.
Why it made the list: Combines extreme weight with historical working-dog credibility. Their mass is functional, not just cosmetic.
4. Boerboel — The South African Powerhouse
Size Class: Giant | Key Trait: Highest muscle density relative to height among mastiff-type breeds
The Boerboel (pronounced "BOOR-bull") is a South African mastiff weighing 150–200 lb (68–91 kg) at 24–27 inches (61–69 cm). They are more agile and athletic than English Mastiffs, originally bred to protect farms from predators. Boerboels require experienced handlers — they are confident, territorial, and need consistent positive reinforcement training from puppyhood. They are not recommended for first-time giant-breed owners. Exercise needs are high: 60–90 minutes of vigorous activity daily.
Why it made the list: Exceptional weight-to-height ratio gives them a uniquely powerful build. AKC recognized the breed in 2015.
5. Leonberger — The Gentle Lion
Size Class: Giant | Key Trait: Largest of the European mountain/herding breeds with a water-resistant double coat
Leonberger males weigh 120–170 lb (54–77 kg) and stand 28–31.5 inches (71–80 cm). Originating in Leonberg, Germany, in the 1840s, they were bred to resemble lions in appearance. They are notably family-friendly, patient with children, and more biddable than many giant breeds. Their thick double coat requires brushing 3–4 times weekly and sheds heavily twice a year. They enjoy swimming and hiking, needing 60 minutes of daily exercise.
Why it made the list: The best balance of extreme size and family-friendly temperament among giant breeds.
6. Newfoundland — The Water Rescue Giant
Size Class: Giant | Key Trait: Natural swimming ability with webbed feet and a water-resistant coat
Newfoundlands weigh 130–150 lb (59–68 kg) for males at 28 inches (71 cm). Bred as working dogs for Canadian fishermen, they have an instinctive ability to swim and perform water rescues. Their temperament is exceptionally sweet — the breed is often described as "nanny-like" around children. Drooling and shedding are both significant. They need 45–60 minutes of daily exercise and thrive when they have access to water.
Why it made the list: Unique among giant breeds for their specialized water rescue heritage and webbed feet.
7. Neapolitan Mastiff — The Wrinkled Guardian
Size Class: Giant | Key Trait: Most distinctive loose-skin and wrinkle structure of any giant breed
Neapolitan Mastiffs weigh 150 lb (68 kg) or more for males at 26–31 inches (66–79 cm). Descended from Roman war dogs, they are powerfully built with extensive loose skin and deep wrinkles. They are calm, loyal, and reserved with strangers. Drooling is extreme — among the worst of any breed. They require early and extensive socialization using positive reinforcement methods. Exercise needs are moderate at 30–45 minutes daily. Health-conscious buyers should seek breeders who screen for hip dysplasia and cherry eye.
Why it made the list: Among the heaviest mastiff types with an unmistakable appearance and ancient lineage.
8. Irish Wolfhound — The Tallest Sighthound
Size Class: Giant | Key Trait: Tallest of all sighthounds, originally bred to hunt wolves and elk
Irish Wolfhounds stand a minimum of 32 inches (81 cm) for males, often reaching 34–35 inches, with weight at 120–155 lb (54–70 kg). They are the tallest of the sighthound family, built for speed and endurance. Despite their hunting heritage, they are gentle, dignified, and often shy. They need 60 minutes of daily exercise in a securely fenced area — their prey drive means they will chase small animals. Their rough coat requires weekly brushing. Note: this breed has one of the shortest lifespans on this list at 6–8 years, per the Merck Veterinary Manual.
Why it made the list: Combines exceptional height with a unique sighthound build unlike any mastiff-type breed on this list.
9. Tibetan Mastiff — The Himalayan Guardian
Size Class: Giant | Key Trait: Thickest double coat of any giant breed, adapted for extreme cold
Tibetan Mastiffs weigh 90–150 lb (41–68 kg) for males at 26 inches (66 cm) minimum. Bred to guard monasteries and livestock in the Himalayas, they are independent, alert, and nocturnal by instinct — expect barking at night. Their massive double coat sheds once a year in an intense "blow" that produces extraordinary amounts of fur. They are loyal to their family but aloof with strangers. Exercise needs are moderate at 30–45 minutes daily. They do poorly in hot climates.
Why it made the list: At the upper end of their weight range, they rival any breed on this list, and their coat mass adds significant visual bulk.
10. Dogue de Bordeaux — The French Mastiff
Size Class: Giant | Key Trait: Largest head circumference relative to body size of any breed
The Dogue de Bordeaux weighs 110 lb (50 kg) or more for males at 23–27 inches (58–69 cm). They have the largest head-to-body ratio of any breed, with a skull circumference approaching the dog's height at the withers. Bred in France as a guardian and draft animal, they are loyal, calm, and deeply bonded to their families. Drooling is heavy. They need 30–45 minutes of moderate daily exercise. Their brachycephalic (short-faced) structure means they are heat-sensitive and should never be exercised in hot weather.
Why it made the list: Compact but extremely heavy for their height, with a uniquely powerful build and ancient French lineage.
Breed Comparison Table: Size, Cost, and Care at a Glance
| Breed | Male Weight (lb/kg) | Male Height (in/cm) | Lifespan (years) | Exercise (min/day) | Annual Care Cost |
|---|---|---|---|---|---|
| English Mastiff | 160–230 / 73–104 | 30+ / 76+ | 6–10 | 30–45 | $3,200–$5,500 |
| Great Dane | 140–175 / 64–79 | 30–32 / 76–81 | 7–10 | 60–90 | $2,800–$4,800 |
| Saint Bernard | 140–180 / 64–82 | 28–30 / 71–76 | 8–10 | 45–60 | $2,900–$5,000 |
| Boerboel | 150–200 / 68–91 | 24–27 / 61–69 | 9–11 | 60–90 | $2,500–$4,200 |
| Leonberger | 120–170 / 54–77 | 28–31.5 / 71–80 | 7–9 | 60 | $2,800–$4,600 |
| Newfoundland | 130–150 / 59–68 | 28 / 71 | 9–10 | 45–60 | $2,600–$4,400 |
| Neapolitan Mastiff | 150+ / 68+ | 26–31 / 66–79 | 7–9 | 30–45 | $3,000–$5,200 |
| Irish Wolfhound | 120–155 / 54–70 | 32–35 / 81–89 | 6–8 | 60 | $3,200–$5,800 |
| Tibetan Mastiff | 90–150 / 41–68 | 26+ / 66+ | 10–12 | 30–45 | $2,200–$3,800 |
| Dogue de Bordeaux | 110+ / 50+ | 23–27 / 58–69 | 5–8 | 30–45 | $2,800–$5,000 |
Annual care cost includes food (large-breed formula kibble at $60–$120/month), routine veterinary care ($600–$1,200/year), preventive medications ($300–$600/year), grooming, supplies, and pet insurance premiums. Does not include emergency veterinary costs, which for giant breeds average $2,000–$6,000 per incident.
Understanding Giant Breed Health Risks and Costs
Owning one of the biggest dog breeds means budgeting for health conditions that disproportionately affect giant dogs. The three most significant are:
Gastric Dilatation-Volvulus (GDV / Bloat): This life-threatening condition, where the stomach fills with gas and twists, is most common in deep-chested giant breeds. Great Danes, Saint Bernards, and Irish Wolfhounds are at highest risk. Prophylactic gastropexy surgery (tacking the stomach to the abdominal wall) costs $400–$800 when performed during spay/neuter and can be life-saving. According to AVMA resources on GDV, emergency treatment without prophylaxis costs $3,000–$7,000.
Hip and Elbow Dysplasia: Joint malformation is prevalent across all giant breeds. Responsible breeders screen via OFA (Orthopedic Foundation for Animals) or PennHIP evaluations — always ask to see certificates before purchasing a puppy. Treatment ranges from conservative management ($200–$500/month in supplements and pain medication) to total hip replacement ($5,000–$8,000 per hip).
Dilated Cardiomyopathy (DCM): Heart disease is a leading cause of death in Great Danes, Irish Wolfhounds, and Newfoundlands. Annual cardiac screening via echocardiogram costs $200–$400. Consult your veterinarian about breed-appropriate cardiac screening schedules starting at age 2–3.
⚠️ Giant Breed Emergency Red Flags
Call your vet or emergency clinic immediately if your giant breed dog shows:
- Distended or swollen abdomen with unproductive retching (bloat/GDV)
- Sudden hind-leg weakness or inability to stand
- Labored breathing or blue-tinged gums
- Acute collapse or inability to rise
ASPCA Animal Poison Control: (888) 426-4435 (24/7, consultation fee applies)
Honorable Mentions and Breeds to Consider Carefully
Honorable Mentions — Close but Below the Threshold:
- Bernese Mountain Dog (80–115 lb / 36–52 kg): Beautiful and family-friendly but falls just below the 100+ lb minimum for most males. Excellent alternative if you want a large but slightly more manageable dog.
- Anatolian Shepherd (110–150 lb / 50–68 kg): Meets weight criteria but is an extremely independent livestock guardian breed. Not suitable for suburban homes or first-time owners. Requires specialized handling experience.
- Cane Corso (100–120 lb / 45–54 kg): Athletic and powerful but at the lower end of giant-breed weight. More of a large breed than a true giant. Note: check local breed-specific legislation, as some jurisdictions restrict mastiff-type breeds.
Breeds to Approach with Caution:
- "Teacup" or "Miniature" versions of giant breeds: These are not recognized by any major registry and are typically the result of unethical breeding practices that prioritize novelty over health.
- Designer "giant" mixes (e.g., Daniff, Mastador): Without standardized health testing, these crosses inherit unpredictable combinations of giant-breed health risks. If you want a mixed-breed giant, adopt from a breed-specific rescue where the dog's health has been evaluated.
Decision Framework: Which Giant Breed Fits Your Life?
Choose Based on Your Top Priority
If your priority is a calm, low-energy companion for apartment or smaller-home living:
- → English Mastiff — Lowest exercise needs (30–45 min), content to lounge for hours. Needs floor space for their size but doesn't need a yard.
- → Runner-up: Dogue de Bordeaux — Similarly low-energy but more heat-sensitive due to brachycephalic structure. Best in climate-controlled homes.
If your priority is an active outdoor partner for hiking, swimming, or running:
- → Leonberger — Loves hiking, swimming, and cold-weather activities. Best all-around athletic giant breed for active families.
- → Runner-up: Great Dane — Surprisingly athletic for their size. Needs 60–90 minutes of daily exercise and does well with jogging (after growth plates close at 18–24 months).
If your priority is a family dog with children and other pets:
- → Newfoundland — Highest family-friendliness rating of any giant breed. Patient, gentle, and famously tolerant of children. Supervision still required due to sheer size.
- → Runner-up: Leonberger — Bred as a family companion in Germany. Equally good with children but requires more grooming commitment.
If your priority is the absolute biggest dog possible:
- → English Mastiff for maximum weight (160–230 lb)
- → Great Dane for maximum height (30–34 inches at shoulder)
If you're a first-time giant breed owner:
- → Start with Newfoundland or Leonberger — both are biddable, eager to please, and forgiving of training mistakes. Avoid Boerboel, Tibetan Mastiff, or Neapolitan Mastiff as a first giant breed.
The Real Cost of Living with the Biggest Dog Breeds
Before committing to a giant breed, understand the full financial picture. Here's what giant breed owners actually spend in 2026:
- Puppy purchase price: $1,500–$4,000 from a health-tested, responsible breeder (varies by breed; Tibetan Mastiffs and Boerboels tend toward the higher end)
- Food: $70–$140/month on large-breed or giant-breed formula kibble (brands like Royal Canin Giant, Purina Pro Plan Large Breed, or Hill's Science Diet Large Breed). That's $840–$1,680/year.
- Heartworm and flea/tick prevention: $30–$60/month — giant breeds require the highest dosage tier, which costs more.
- Crates and beds: $150–$400 for an XXL crate (48–54 inch) and $80–$250 for a giant-breed orthopedic bed. These are not optional — your dog needs joint support.
- Veterinary care: Giant breeds cost 30–50% more per vet visit than medium breeds due to weight-based medication dosing. Budget $800–$1,500/year for routine care.
- Pet insurance: $60–$120/month for comprehensive coverage. Companies like Trupanion, Healthy Paws, and Nationwide cover giant breeds, but premiums reflect higher claim averages.
- Emergency fund: Keep $3,000–$5,000 accessible. GDV surgery, cardiac events, and orthopedic injuries are common and expensive.
Total first-year cost estimate: $6,000–$12,000 (including puppy purchase). Ongoing annual cost: $3,000–$6,000 depending on breed and health status.
Frequently Asked Questions
What is the biggest dog breed in the world?
By weight, the English Mastiff is the biggest dog breed, with males averaging 160–230 lb (73–104 kg). By height, the Great Dane holds the record, with males standing 30–32 inches at the shoulder and some individuals reaching 34 inches. The answer depends on whether you measure "biggest" by mass or height.
Are giant dog breeds good with children?
Many giant breeds — especially Newfoundlands, Leonbergers, and Saint Bernards — are exceptionally patient and gentle with children. However, their sheer size creates accidental risks: a 150 lb dog can knock over a toddler simply by walking past them. Always supervise interactions between giant breeds and small children, and teach children to respect the dog's space.
How long do the biggest dog breeds live?
Giant breeds have shorter lifespans than smaller dogs. The range across this list is 5–12 years, with most breeds averaging 7–10 years. The Tibetan Mastiff is an outlier at 10–12 years, while the Dogue de Bordeaux and Irish Wolfhound are on the shorter end at 5–8 years. Larger body size correlates with faster aging in dogs — a well-documented phenomenon in veterinary science.
Do giant breeds need a big yard?
Not necessarily. English Mastiffs and Dogue de Bordeaux are relatively low-energy and can do well in apartments or homes without yards, provided they get their daily walks. However, athletic breeds like Great Danes, Leonbergers, and Irish Wolfhounds benefit significantly from access to a fenced yard for off-leash exercise. A securely fenced area (minimum 6-foot fence for sighthounds) is essential.
What should I feed a giant breed puppy?
Giant breed puppies must be fed a large-breed or giant-breed puppy formula that meets AAFCO growth requirements with controlled calcium and phosphorus levels. Rapid growth increases the risk of developmental orthopedic diseases like hip dysplasia and osteochondrosis. Look for formulas labeled "growth" or "all life stages" with the AAFCO statement confirming suitability for large-breed puppies. Feed measured meals (not free-choice) and monitor body condition score weekly. Consult your veterinarian for a breed-specific growth curve.
Which giant breeds are best for first-time owners?
The Newfoundland and Leonberger are the most forgiving for first-time giant breed owners. Both are eager to please, respond well to positive reinforcement training, and have stable temperaments. Breeds to avoid as a first giant include the Boerboel, Tibetan Mastiff, and Neapolitan Mastiff — all require experienced handlers who understand canine body language and can manage a powerful, strong-willed dog.
Should I get pet insurance for a giant breed?
Yes — strongly recommended. Giant breeds have higher rates of expensive conditions (GDV, hip dysplasia, cardiac disease, osteosarcoma). A $100/month premium can offset $5,000–$10,000 in emergency costs. Enroll while your dog is young and healthy, as pre-existing conditions are excluded by all major insurers.
Marcus Aldridge
All our authors care for dogs every day — read more of their work on the authors page.
