What Is the Biggest Dog Breed? Meet the World’s Largest Dogs

ByDr. Michael

When it comes to canines, some people love tiny lap dogs—others want a furry giant by their side. If you’re curious about what is the biggest dog breed in the world, you’re in for a towering treat. From massive mastiffs to lanky Irish Wolfhounds, the largest dog breeds are known not just for their size but also their loyalty, strength, and gentle nature. In this article, we’ll explore the biggest dog breeds ranked by height and weight, what makes them unique, and what you should know before adopting a gentle giant.

Table of Contents

What Does “Biggest” Really Mean?

The term “biggest dog breed” can refer to height, weight, or overall body mass. Some breeds are incredibly tall but lean, while others are shorter yet extremely bulky. For example, the Irish Wolfhound is the tallest breed, often exceeding 32 inches at the shoulder, while the English Mastiff holds the record for the heaviest dog, with some males weighing over 250 pounds.

So, when asking what is the largest dog breed, it depends on which measurement you prioritize—height or weight.

Top 10 Largest Dog Breeds

Here’s a look at the most massive dog breeds known for their impressive stature and strength:

  1. Irish Wolfhound – Tallest of all dog breeds
  2. English Mastiff – Heaviest dog on record
  3. Great Dane – Iconic height with a sleek body
  4. Saint Bernard – Gentle giant originally bred for mountain rescues
  5. Newfoundland – Known for strength and swimming ability
  6. Leonberger – A lion-like mix of size and beauty
  7. Scottish Deerhound – Similar to the Irish Wolfhound but slightly lighter
  8. Boerboel – South African mastiff-type guard dog
  9. Tibetan Mastiff – Fluffy, powerful, and independent
  10. Bernese Mountain Dog – Strong working dog with a sweet temperament

1. Irish Wolfhound – Tallest Dog Breed

Standing at up to 35 inches tall, the Irish Wolfhound is recognized as the tallest dog breed in the world. Despite their imposing height, they are incredibly gentle, calm, and friendly. Historically bred to hunt wolves, these dogs are now beloved for their loyal companionship.

  • Height: 30–35 inches
  • Weight: 110–180 pounds
  • Lifespan: 6–8 years

2. English Mastiff – Heaviest Dog Breed

When it comes to sheer mass, nothing tops the English Mastiff. The largest recorded English Mastiff named Zorba weighed over 340 pounds! They have a gentle and calm demeanor, making them affectionate family pets despite their size.

  • Height: 27–32 inches
  • Weight: 160–230+ pounds
  • Lifespan: 6–10 years

Other Giant Dog Breeds to Know

Several other breeds also rank among the biggest dogs in the world:

Great Dane

Known for their sleek physique and tall frame, Great Danes often exceed 30 inches in height and are incredibly loyal.

Saint Bernard

Originally bred to rescue travelers in the Swiss Alps, these dogs are huge, strong, and sweet-natured.

Newfoundland

This water-loving breed excels in swimming and water rescues. Their gentle nature makes them great family dogs.

Leonberger

A majestic dog that looks like a lion, the Leonberger is both powerful and sensitive—ideal for experienced owners.

An English Mastiff standing on the grass

Caring for Extra-Large Dog Breeds

Owning a giant dog isn’t just about making room on your couch—it comes with unique care requirements:

  • Joint health: Large breeds are prone to hip dysplasia and arthritis. Joint supplements and soft bedding help.
  • Exercise: Daily walks and playtime are essential, but avoid high-impact activities for growing puppies.
  • Space: Big dogs need more room—ideally a yard or large living space.
  • Diet: Choose high-quality food formulated for large or giant breeds to support bone and joint development.
  • Training: Obedience training is crucial—an unruly 200-pound dog is hard to manage.

Pros and Cons of Owning a Giant Dog

✅ Pros:

  • Loyal and protective
  • Often calm and gentle with children
  • Great deterrent for intruders
  • Strong bonds with their families

❌ Cons:

  • Shorter average lifespan
  • Higher food, vet, and medication costs
  • Needs lots of space and exercise
  • Can be overwhelming for inexperienced owners

FAQ

What is the biggest dog breed in terms of height?

The Irish Wolfhound is the tallest dog breed, often exceeding 32 inches at the shoulder.

What dog holds the world record for size?

An English Mastiff named Zorba holds the record for the heaviest dog, weighing over 340 pounds.

Are giant dog breeds good with kids?

Yes, many large breeds like the Saint Bernard and Newfoundland are known for being gentle, affectionate, and protective with children.

Do large dogs require more exercise?

They need regular activity to stay healthy, but not as much intense exercise as high-energy smaller breeds. Joint care is also important during growth.

How long do giant dog breeds live?

Most large and giant breeds have shorter lifespans, typically ranging from 6 to 10 years, depending on the breed and health care.

Conclusion

So, what is the biggest dog breed? The answer depends on how you define “biggest”—the Irish Wolfhound takes the crown for height, while the English Mastiff wins for weight. These giants may seem intimidating at first glance, but they are often some of the kindest, most loyal companions you can have. With proper care, space, and love, owning a giant dog can be one of life’s most rewarding experiences—just be prepared for extra-large everything!

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