Biggest Dog in the World: Tallest, Heaviest & Friendliest

The title of biggest dog depends on whether you measure height or weight — and the two champions are different breeds. Here’s what the breed standards and record books actually say about the dogs that take the crown.

World’s tallest dog ever: Zeus (Great Dane): 44 inches at the shoulder (Wikipedia – Guinness record) ·
Heaviest dog ever: Zorba (English Mastiff): 343 pounds (Chestermere Veterinary Clinic) ·
Tallest breed average: Great Dane: 28–32 inches (AKC breed standard) ·
Heaviest breed average: English Mastiff: 160–230 pounds (Good Housekeeping)

What is the world’s largest dog?

The title depends on whether you measure height at the shoulder or sheer body weight – and the two lists have different champions. Zeus the Great Dane (Wikipedia – Guinness record) holds the official height record at 44 inches (111.8 cm), while Zorba the English Mastiff (Chestermere Veterinary Clinic) is the heaviest ever recorded at 343 pounds (155.6 kg).

By height vs by weight

• By height: Great Dane – shoulder height up to 32 inches on average (AKC – breed standard); record holders exceed 40 inches.
• By weight: English Mastiff – average 160–230 lbs (Good Housekeeping – lifestyle media); record holder Zorba hit 343 lbs.

Historical record holders

• 2010–2011: Titan (Great Dane) – 42.2 inches (Wikipedia – list of largest dogs)
• 2011–2013: Zeus (Great Dane) – 44 inches (Wikipedia – Guinness record)
• 2013–2015: Freddy (Great Dane) – 40.75 inches (Wikipedia – dog record)
• 2022–present: Kevin (Great Dane) – 38+ inches (Wikipedia – list of largest dogs)

The implication: Great Danes have dominated the height record for two decades. No breed has come close to matching their shoulder stature. The catch is that these extreme sizes come with significant health trade-offs, which we’ll cover later.

What is the tallest dog breed?

Average height at the shoulder is the standard measure, and three breeds consistently compete for the top rung. American Kennel Club (breed standard) sets the Great Dane minimum at 28 inches for males; Irish Wolfhounds can reach 32 inches according to Good Housekeeping (lifestyle media).

• Great Dane: 28–32 inches (Purina UK – pet nutrition)
• Irish Wolfhound: 30–32 inches (PetMD – veterinary advice)
• Scottish Deerhound: 28–32 inches (Wikipedia – breed profile)

The pattern: Great Danes edge out Wolfhounds by a fraction of an inch on average, but individual Irish Wolfhounds can be slightly taller. The trade-off: Wolfhounds are significantly lighter, which affects their overall “biggest” claim.

Is Great Dane or Irish Wolfhound bigger?

A direct comparison shows why this question is trickier than it seems. The table below stacks the two breeds across height, weight, and build.

What this means: Great Danes are slightly taller on average and much heavier. If “bigger” means overall mass, the Great Dane wins. If you care about reaching the tallest possible shoulder height, an Irish Wolfhound can match or exceed a Dane, but it won’t have the same bulk.

What are the top 3 biggest dog breeds?

Rankings shift depending on whether you sort by height or weight. Here are the leaders in each category.

By height

• Great Dane – 28–32 inches (AKC)
• Irish Wolfhound – 30–32 inches (PetMD)
• Scottish Deerhound – 28–32 inches (Wikipedia)

By weight

• English Mastiff – 160–230 lbs (Good Housekeeping)
• Saint Bernard – 140–180 lbs (Purina UK)
• Great Dane – 110–175 lbs (AKC)

The choice between height and weight ultimately depends on what “biggest” means to you.

What is the number one killer of Great Danes?

Giant breeds face unique health challenges, and Great Danes are particularly susceptible to gastric dilation-volvulus (GDV), commonly called bloat. According to PetMD – veterinary advice, bloat is the leading cause of death in Great Danes, a condition where the stomach twists and cuts off blood flow. Deep-chested breeds are at highest risk, and without emergency surgery it’s often fatal.

• GDV (bloat): Most common killer; requires immediate treatment.
• Cardiomyopathy: Heart disease, especially dilated cardiomyopathy (PetMD – cardiac condition).
• Osteosarcoma: Bone cancer, more frequent in large breeds (AKC – expert advice).

The catch: these conditions reduce average Great Dane lifespan to 7–10 years, and for some giants like Irish Wolfhounds, it’s even shorter at 6–8 years (PetMD). Owners need to budget for potential emergency care and regular health screenings. For more on animal health, see our article on Foot and Mouth Disease.

What is the biggest friendliest dog breed?

“Friendliest” is subjective, but several large breeds are consistently cited for their gentle, patient temperaments. American Kennel Club (breed standard) describes Great Danes as “friendly, patient, and dependable with children.” Similarly, Saint Bernards and Newfoundlands are famed for their calm, family-oriented behaviour.

• Great Dane: Gentle giant, good with kids – 7–10 year lifespan.
• Saint Bernard: Patient, protective – 8–10 years (AKC).
• Newfoundland: Sweet, water-rescue nature – 8–10 years (AKC).
• English Mastiff: Calm, loyal – 6–10 years (Good Housekeeping).

When comparing animal species, size and temperament vary widely; see also Difference Between Crocodile and Alligator.

Across the largest breeds, the numbers tell a consistent story about size limits.

The evidence is clear: height and weight champions are different breeds, and neither one is inherently “better.” For prospective owners, the choice between a Great Dane and an English Mastiff comes down to space and lifestyle. A Great Dane demands less floor space than a Mastiff but still needs room to stretch, and both require careful management of health risks like bloat. For families seeking the friendliest giant, the Great Dane’s gentle temperament combined with its stature makes it a top pick, but the shorter lifespan means the commitment is intense but brief.

Frequently asked questions