World's Largest Dog Breeds: 10 Gentle Giants Ranked by Size
Discover the world's largest dog breeds ranked by height, weight, and temperament. Includes size comparisons, health risks, and a decision framework...
What Qualifies as the World's Largest Dog Breed?
When people search for the world's largest dog breed, they're usually picturing a dog that can stand on its hind legs and look a human in the eye. But "largest" means different things depending on whether you're measuring height at the shoulder, total body weight, or overall mass. For this list, we're using a combined criteria that accounts for both height and weight, with a minimum threshold of 120 pounds (54 kg) for males and 90 pounds (41 kg) for females.
Selection Criteria for This List
- Minimum male weight: 120 lb (54 kg) per AKC breed standards
- Minimum male height: 26 inches (66 cm) at the withers
- Breed recognition: Must be recognized by AKC, FCI, or UKC
- Temperament data: Sufficient behavioral research available for family placement
- Accessibility: Breeds available to responsible pet owners (not restricted working/guard breeds only)
The breeds below are grouped logically by primary function — working/guardian breeds first, then sighthounds, then companion giants — so you can compare dogs with similar historical purposes side by side.
The 10 Largest Dog Breeds in the World
1. English Mastiff — The Heaviest Breed on Earth
Size Class: Giant (160–230 lb / 73–104 kg males; 120–170 lb / 54–77 kg females)
Key Trait: Unmatched body mass — holds the record for heaviest dog ever recorded (Zorba, 343 lb / 155 kg)
The English Mastiff is the definitive answer when someone asks what the world's largest dog breed is by weight. Despite their imposing size, Mastiffs are famously docile and bond deeply with their families. They require minimal exercise (20–30 minutes daily) but need significant space and a budget for their enormous food bills — expect $150–$200 per month on quality kibble alone.
2. Great Dane — The Tallest Breed Alive
Size Class: Giant (140–175 lb / 64–79 kg males; 110–140 lb / 50–64 kg females)
Key Trait: Record-breaking height — Zeus, a Great Dane, measured 44 inches (112 cm) at the shoulder
If you define "largest" by height, the Great Dane wins. These dogs regularly exceed 30 inches (76 cm) at the withers and can look you in the eye while standing on all four legs. Despite their athletic build, Great Danes are notorious couch potatoes who need only 30–45 minutes of moderate exercise daily. They're excellent with children but have one of the shortest lifespans of any breed — 7–10 years is typical.
3. Saint Bernard — The Alpine Rescue Legend
Size Class: Giant (140–180 lb / 64–82 kg males; 120–140 lb / 54–64 kg females)
Key Trait: Exceptional cold-weather endurance and family devotion
Saint Bernards combine substantial mass with surprising agility in rough terrain. Originally bred to locate avalanche victims in the Swiss Alps, they retain a calm, patient temperament that makes them excellent family dogs. They drool — a lot — and shed heavily twice yearly, so prospective owners should budget for professional grooming ($60–$90 per session) and keep towels handy.
4. Boerboel — The South African Guardian
Size Class: Giant (150–200 lb / 68–91 kg males; 110–150 lb / 50–68 kg females)
Key Trait: Protective instinct paired with family loyalty
The Boerboel (pronounced "boor-bool") was developed in South Africa to protect homesteads from leopards and baboons. They're intensely loyal to their families but require experienced handlers and consistent positive reinforcement training from puppyhood. Boerboels are not recommended for first-time owners or households with frequent visitors, as their guarding instincts are strong.
5. Leonberger — The Gentle Family Giant
Size Class: Giant (120–170 lb / 54–77 kg males; 100–135 lb / 45–61 kg females)
Key Trait: Balanced temperament suitable for active families with children
Bred in Germany as an all-purpose farm dog, the Leonberger is one of the most family-friendly giant breeds. They're patient with children, generally good with other pets, and eager to please during training sessions. Leonbergers need 45–60 minutes of daily exercise and thrive in homes with fenced yards where they can roam. Their thick double coat requires brushing 2–3 times weekly.
6. Neapolitan Mastiff — The Wrinkled Watchdog
Size Class: Giant (150 lb / 68 kg average males; 110 lb / 50 kg average females)
Key Trait: Intimidating appearance with surprisingly calm indoor demeanor
Neapolitan Mastiffs are instantly recognizable by their loose, wrinkled skin and massive heads. Despite their guard-dog heritage, they're typically quiet and sedentary indoors, preferring to lounge near their family. They require early socialization and positive reinforcement training to ensure they're comfortable with strangers and other animals. Drool management is a daily reality for Neapolitan Mastiff owners.
7. Newfoundland — The Water Rescue Specialist
Size Class: Giant (130–150 lb / 59–68 kg males; 100–120 lb / 45–54 kg females)
Key Trait: Natural swimming ability and lifesaving instinct
Newfoundlands have webbed feet, a water-resistant double coat, and an instinctive drive to rescue people from drowning — even in calm water, they'll attempt to "save" swimmers. They're among the gentlest giant breeds and excel as therapy dogs. Newfoundlands need access to water for swimming (their preferred exercise) and require regular grooming to prevent matting. They're prone to drooling and tracking mud indoors.
8. Tibetan Mastiff — The Himalayan Guardian
Size Class: Giant (100–160 lb / 45–73 kg males; 75–125 lb / 34–57 kg females)
Key Trait: Independent temperament and nocturnal guarding instinct
Tibetan Mastiffs were bred to guard monasteries and livestock in the Himalayas, and they retain strong independent streaks. They're not typical obedience dogs — they'll assess situations and decide whether to comply. Tibetan Mastiffs are nocturnal by nature and may bark extensively at night if kept outdoors. They require patient, experienced owners who understand primitive breed behavior.
9. Irish Wolfhound — The Tallest Sighthound
Size Class: Giant (120 lb / 54 kg minimum males; 105 lb / 48 kg minimum females)
Key Trait: Combination of height and speed — can reach 35 mph in short bursts
Irish Wolfhounds are the tallest of the sighthounds, with males standing at least 32 inches (81 cm) at the shoulder. Despite their size, they're built for speed and need secure, fenced areas to run safely. They're gentle, dignified dogs who bond closely with their families but have relatively short lifespans (6–8 years). Irish Wolfhounds are prone to bloat and require multiple small meals daily.
10. Anatolian Shepherd — The Livestock Protector
Size Class: Giant (110–150 lb / 50–68 kg males; 80–120 lb / 36–54 kg females)
Key Trait: Endurance to patrol large properties independently for hours
Anatolian Shepherds are working livestock guardians who need jobs to do. They're not typical house pets — they thrive on large properties where they can patrol and protect. Anatolians are independent thinkers who may not respond reliably to recall commands, so secure fencing is essential. They're best suited to rural or suburban owners with experience handling guardian breeds.
How Do These Giant Breeds Compare?
| Breed | Male Weight (lb/kg) | Male Height (in/cm) | Lifespan (years) | Exercise Needs | Family Friendly |
|---|---|---|---|---|---|
| English Mastiff | 160–230 / 73–104 | 30+ / 76+ | 6–10 | Low (20–30 min) | Excellent |
| Great Dane | 140–175 / 64–79 | 30–32 / 76–81 | 7–10 | Moderate (30–45 min) | Excellent |
| Saint Bernard | 140–180 / 64–82 | 28–30 / 71–76 | 8–10 | Moderate (30–60 min) | Excellent |
| Boerboel | 150–200 / 68–91 | 24–27 / 61–69 | 9–11 | High (60+ min) | Good (experienced owners) |
| Leonberger | 120–170 / 54–77 | 28–31.5 / 71–80 | 7–9 | Moderate-High (45–60 min) | Excellent |
| Neapolitan Mastiff | 150 / 68 avg | 26–31 / 66–79 | 7–9 | Low-Moderate (20–30 min) | Good (experienced owners) |
| Newfoundland | 130–150 / 59–68 | 28 / 71 | 9–10 | Moderate (30–60 min) | Excellent |
| Tibetan Mastiff | 100–160 / 45–73 | 26 / 66 minimum | 10–12 | Moderate (30–45 min) | Good (experienced owners) |
| Irish Wolfhound | 120+ / 54+ | 32+ / 81+ | 6–8 | Moderate (40 min) | Excellent |
| Anatolian Shepherd | 110–150 / 50–68 | 29+ / 74+ | 11–13 | High (60+ min) | Fair (working dog) |
Health Considerations for Giant Breeds
Owning one of the world's largest dog breeds comes with predictable health challenges. Giant breeds (defined as adult weight over 100 lb / 45 kg) face higher risks of specific conditions:
- Gastric Dilatation-Volvulus (GDV/Bloat): Life-threatening stomach torsion. Preventive gastropexy surgery costs $300–$600 and is recommended for at-risk breeds. AKC bloat guide
- Hip and Elbow Dysplasia: Joint malformation affecting 20–40% of giant breeds. Screening X-rays (OFA evaluation) cost $50–$75 per joint.
- Dilated Cardiomyopathy (DCM): Heart muscle disease common in Great Danes, Irish Wolfhounds, and Newfoundlands. Annual cardiac screening recommended after age 3.
- Osteosarcoma: Bone cancer with higher incidence in giant breeds. Early detection improves prognosis, but treatment costs $5,000–$10,000+.
Before committing to a giant breed, budget for $1,500–$3,000 annually in preventive care and potential emergency expenses. Pet insurance premiums for giant breeds typically run $80–$150 per month.
Decision Framework: Which Giant Breed Fits Your Lifestyle?
If you want a low-energy companion:
→ Choose English Mastiff or Neapolitan Mastiff. Both are content with short walks and extensive lounging. Best for apartment dwellers with ground-floor access or homes without large yards.
If you have children and want a patient family dog:
→ Choose Newfoundland, Leonberger, or Saint Bernard. These breeds are famously tolerant of children and integrate well into active family life. Avoid Tibetan Mastiff and Boerboel unless you have extensive guardian breed experience.
If you want an athletic partner for hiking or running:
→ Choose Irish Wolfhound or Anatolian Shepherd (rural properties only). Both need substantial daily exercise and secure spaces to run off-leash. Not suitable for apartment living.
If you need a property guardian:
→ Choose Boerboel, Anatolian Shepherd, or Tibetan Mastiff. These breeds have strong protective instincts and thrive when given territory to patrol. Not recommended for suburban homes with close neighbors due to barking.
If you're a first-time giant breed owner:
→ Start with Great Dane, Newfoundland, or Leonberger. These breeds are more forgiving of training mistakes and generally eager to please. Avoid Tibetan Mastiff and Neapolitan Mastiff until you have experience with strong-willed breeds.
Honorable Mentions and Breeds to Consider Carefully
Honorable Mentions (just outside our criteria):
- Scottish Deerhound: Tall (28–32 inches) but lighter (85–110 lb) — doesn't meet our weight threshold
- Dogue de Bordeaux: Massive head and chest but shorter (23–27 inches) — doesn't meet our height threshold
- Cane Corso: Powerful and imposing (100–120 lb males) but just under our minimum weight
Breeds to Approach with Caution:
- Caucasian Shepherd (Ovcharka): 110–200 lb livestock guardian with extreme protective instincts. Not suitable for suburban environments or inexperienced owners. Requires professional training consultation.
- Kangal: 110–145 lb Turkish guardian with strong prey drive and territorial behavior. Best suited to working farms with experienced handlers.
- Spanish Mastiff: 140–220 lb guardian breed with limited availability outside Europe. Importation costs and health testing challenges make this breed difficult to obtain responsibly.
Frequently Asked Questions About Giant Dog Breeds
What is the world's largest dog breed by weight?
The English Mastiff holds the record for heaviest dog breed. Adult males typically weigh 160–230 lb (73–104 kg), and the heaviest Mastiff ever recorded was Zorba, who weighed 343 lb (155 kg) in 1989.
What is the tallest dog breed in the world?
The Great Dane is the tallest dog breed. Males stand 30–32 inches (76–81 cm) at the shoulder, and the tallest Great Dane ever recorded was Zeus, who measured 44 inches (112 cm) at the withers.
How much does it cost to own a giant breed dog?
First-year costs for a giant breed typically range from $3,500–$6,000, including purchase price ($1,500–$3,000 from a responsible breeder), initial veterinary care, supplies (extra-large crate, reinforced leash, elevated food bowls), and food. Ongoing annual costs range from $2,000–$4,000 for food, preventive care, and insurance.
Do giant breeds live shorter lives?
Yes. Giant breeds (over 100 lb / 45 kg) typically live 6–10 years, compared to 10–13 years for medium breeds and 12–15 years for small breeds. This is due to accelerated aging and higher cancer rates. Merck Veterinary Manual on canine aging
Are giant breeds good with children?
Many giant breeds — including Newfoundlands, Leonbergers, and Saint Bernards — are excellent with children due to their patient, gentle temperaments. However, their size poses accidental injury risks (stepping on small children, knocking toddlers over during play), so supervision is always necessary.
What should I feed a giant breed puppy?
Giant breed puppies require specially formulated large-breed puppy food that limits calcium and phosphorus to prevent rapid bone growth and joint problems. Look for AAFCO statements specifying "growth" or "all life stages" with the notation "including growth of large-size dogs (70 lb or more as an adult)." Feed measured meals (never free-choice) and maintain a lean body condition score (4–5 on a 9-point scale). Consult your veterinarian for specific feeding guidelines based on your puppy's growth rate.
Do giant breeds need special housing?
Giant breeds need reinforced furniture (standard couches may collapse under 200+ lb dogs), extra-large crates (48–54 inches long), elevated food and water bowls to reduce neck strain, and non-slip flooring to prevent joint injuries. They can live in apartments if given adequate exercise, but homes with fenced yards are ideal.
Before bringing any giant breed into your home, consult your veterinarian about breed-specific health screening and discuss whether your lifestyle, space, and budget can accommodate a dog of this size for the next 7–12 years.
Marcus Aldridge
All our authors care for dogs every day — read more of their work on the authors page.
