Biggest Dog in the World: Tallest, Heaviest, and Largest Breeds

Anyone who has ever wondered which dog truly takes the crown for biggest has probably heard conflicting answers. That’s because the title splits depending on whether you measure from paw to shoulder or step on a scale.

Tallest dog ever recorded: Zeus (Great Dane) — 44 inches (1.118 m) ·
Heaviest dog ever recorded: Zorba (English Mastiff) — 343 lbs (155.6 kg) ·
Largest breed by average height: Great Dane — 28–32 inches (71–81 cm) ·
Largest breed by average weight: English Mastiff — 160–230 lbs (73–104 kg)

Three key figures define the extremes: the tallest dog ever, the heaviest dog ever, and the breeds that consistently top the charts.

Who is the world’s largest dog?

The difference between tallest and heaviest

The answer depends entirely on the measure. The tallest dog ever is Zeus, a Great Dane who stood 44 inches (1.118 m) from foot to shoulder, verified by Guinness World Records (official record-keeper) on 4 October 2011. The heaviest dog ever is Zorba, an English Mastiff who tipped the scales at 343 pounds (155.6 kg), as reported by Dog Trick Academy (canine education site). No single dog has ever claimed both titles.

Official records from Guinness World Records

Guinness currently recognizes Zeus (2011) as the tallest dog ever, and a second Great Dane also named Zeus as the tallest living male dog as of 2022, measuring 44 inches and able to reach 7 feet 4 inches on his hind legs (Guinness World Records (news article)). The weight record has not been officially updated since Zorba’s measurement in the 1980s.

The implication: the “largest dog” label is split between two breeds, and anyone asking for a single champion must first decide which dimension matters most.

What are the top 10 biggest dogs?

Breeds recognized for height

When listing the tallest breeds, the Great Dane leads. Multiple Great Danes—Zeus, Giant George, Titan, Gibson—have held or challenged the height record (Guinness World Records). Other tall breeds include the Irish Wolfhound and Scottish Deerhound, though no official record places them above the Great Dane.

• Great Dane – tallest dog ever (Zeus, 44 in)
• Irish Wolfhound – among tallest, but no official record
• Scottish Deerhound – tall but lighter build

Breeds recognized for weight

For sheer mass, the English Mastiff dominates. Zorba weighed 343 lbs, and another Mastiff named Hercules carried 282 lbs (Dog Trick Academy). Saint Bernards and Neapolitan Mastiffs are also heavy breeds, but Zorba’s record remains untouched.

• English Mastiff – heaviest record (Zorba, 343 lbs)
• Saint Bernard – heavy, but no record
• Neapolitan Mastiff – dense build

Honorable mentions

Some breeds like the Tibetan Mastiff are frequently described as giant, but Dog Trick Academy notes that without official Guinness verification, their claims remain unconfirmed. The pattern is clear: the record-holders are Great Danes (height) and English Mastiffs (weight), and any list of biggest dogs must acknowledge both.

Is the Irish Wolfhound the largest dog?

Height vs. weight arguments

Irish Wolfhounds are among the tallest breeds, often reaching over 30 inches at the shoulder. However, no Irish Wolfhound has been officially verified as taller than the Great Dane record. The heaviest dog is an English Mastiff, so the Irish Wolfhound does not hold either extreme.

Comparison to Great Dane

According to Guinness, the tallest dog ever is a Great Dane, not an Irish Wolfhound. While individual Irish Wolfhounds may exceed some Great Danes in height, the official record belongs to Zeus. The trade-off: Great Danes are generally heavier in bone mass, giving them an overall larger appearance.

What is the Tallest Dog Breed?

Great Dane

The Great Dane is the breed of every official tallest dog on record. Zeus (2011) measured 44 inches; Giant George and Titan also came close (Wikipedia (community encyclopedia)). The breed standard for male Great Danes is 30–32 inches, making them the tallest breed by average height.

Irish Wolfhound

Irish Wolfhounds are close contenders, with a breed standard of 30+ inches, but they typically have a lighter frame. No Irish Wolfhound has been recorded by Guinness as taller than the top Great Danes.

Other tall breeds

The Scottish Deerhound and Borzoi are also tall, but they lack the mass to compete for the “largest” title. The verdict: the Great Dane holds the crown for height.

Is an Irish Wolfhound bigger than a Great Dane?

Height comparison

On average, Great Danes are taller as a breed. The tallest individual is a Great Dane. While some Irish Wolfhounds may match smaller Great Danes, the record is firmly with the Dane.

Weight comparison

English Mastiffs are heavier than both breeds. Neither the Irish Wolfhound nor the Great Dane holds the weight record. For typical specimens, Great Danes tend to outweigh Irish Wolfhounds due to denser bone structure.

Record holders

The tallest dog ever is a Great Dane (Zeus). The heaviest is an English Mastiff (Zorba). The Irish Wolfhound does not appear in either record. Therefore, an Irish Wolfhound is not bigger than a Great Dane in any official sense.

Three record-holders across two breeds: two Great Danes for height, one English Mastiff for weight.

Timeline of the biggest dogs

Key dates in the history of giant dog records:

• 1980s: Zorba, an English Mastiff, weighed 343 lbs and set the heaviest dog record that still stands (Dog Trick Academy).
• 22 February 2010: Giant George, a Great Dane, dethroned Titan as tallest dog (Wikipedia).
• 4 October 2011: Zeus (Great Dane) officially measured at 44 inches (1.118 m), becoming the tallest dog ever (Guinness World Records).
• May 2022: A different Great Dane named Zeus confirmed as tallest living male dog, also 44 inches (Guinness World Records (news)).

No new official record has been set since 2022, though claims of larger dogs occasionally surface.

Clarity: what we know and what remains uncertain

Confirmed facts

• Zeus (Great Dane) is the tallest dog ever recorded by Guinness (Guinness World Records).
• Zorba (English Mastiff) is the heaviest dog ever recorded (Dog Trick Academy).
• The Great Dane is the tallest breed on average, based on record history.

What’s still unclear

• Whether the Irish Wolfhound or Great Dane is taller on average depends on specific bloodlines and measurement methods.
• Some breeds like Tibetan Mastiff are often claimed as largest but lack official record verification.

Expert perspectives

“Guinness currently recognizes Zeus, a Great Dane from the United States, as the tallest dog ever (male).” Guinness World Records (official record-keeper)

“Zorba, an English Mastiff, weighed 343 pounds.” Dog Trick Academy (canine education site)

“Titan, a male Great Dane, previously held the Guinness world record as the tallest dog, measuring 107.3 cm.” Wikipedia (community encyclopedia)

So what does all this mean for someone looking for the biggest dog in the world? The answer is neither simple nor singular. If you measure by height, the Great Dane is the undisputed champion. If you measure by weight, the English Mastiff takes the prize. For anyone considering adding one of these giants to their home, the choice comes down to whether you prefer a skyscraper or a boulder. Both are massive, both require serious commitment, and the ‘biggest’ in your life is ultimately a matter of which metric you value most.

For a deeper look at which individual animals have held the official titles, check out the Biggest Dog in the World record holders article covering both height and weight champions.

Frequently asked questions