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What is the Fattest Dog on Earth? Plus Other Heavy Breeds (Answered 2024)

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What is the fattest dog on earthEver felt like you’re carrying the weight of the world on your shoulders? That’s how the world’s heaviest dog breeds feel every day. Burdened by their love of treats and genetic luck of the draw, these gentle giants lug around hundreds of pounds like it’s no big deal.

But don’t worry – these chunky pups are more than happy to let their fluffy folds bounce with each step. Their excess poundage just means there’s more doggy to love! From saggy-skinned English Mastiffs to lumbering Irish Wolfhounds, these XXL furballs prove that being healthy doesn’t always mean being skinny.

Of course, their laidback attitudes aren’t without risks – obesity in pets is no laughing matter. But one look in their soulful eyes, and you’ll know these patient pooches don’t hold a grudge over their robust physique.

So pull up a seat and get ready to meet the world’s roundest, proudest pups!

Key Takeaways

  • Mastiffs and other giant breeds are prone to obesity-related health issues such as bloat, joint pain, and heart disease due to their size.
  • Overfeeding large breed puppies can increase the risk of joint problems due to rapid growth.
  • Obese dogs, regardless of breed, have shorter lifespans and are more prone to various health issues compared to dogs with a healthy weight.
  • Daily exercise, such as swimming and hiking, is essential for large breeds to maintain a healthy weight and overall well-being.

World’s Fattest Dog Title Changes

You’ve just learned that Bopper the Whopper recently displaced Hattie as the new titleholder for Britain’s heaviest hound, tipping the scales at over 8 stone. As a veterinary nutritionist, I understand the immense challenge you now face to help Bopper shed weight safely.

His obesity puts him at risk for joint problems, diabetes, and heart disease – potentially shortening his life. With your compassion and commitment, though, we can absolutely get him on the right path.

I’ll help develop a customized diet plan cutting calories without sacrificing nutrition. We’ll swap unhealthy filler like corn for lean proteins and fiber to keep him satisfied. Regular walks and play will get him moving again and strengthen his bones and muscles.

With time, the pounds will come off, revealing the healthy, happy dog that’s been hidden beneath them.

Together, we’ll give Bopper the best life possible.

Tibetan Mastiff

Tibetan Mastiff
Leaving behind Britain’s fattest dogs, let’s explore the massive Tibetan Mastiff.

Towering in height with thick fur coats in various colors, Tibetan Mastiffs can weigh over 150 pounds. To keep your Tibetan Mastiff healthy, focus on daily conditioning like brisk walks and swims to build muscle and stamina underneath all that fur.

Use a front-clip harness for better control while training good leash manners. Schedule regular grooming to keep the heavy coat mat-free.

Socialize your Tibetan Mastiff young to curb any unwarranted aggression. While quite large, Tibetan Mastiffs can be gentle, loyal giants when properly conditioned and handled.

Kangal Shepherd Dog

Kangal Shepherd Dog
Gotta say, the Kangal Shepherd Dog is one impressive canine. Sturdy and loyal, they make great guardians.

Let’s move on to discussing another enormous breed next.

  1. Males can weigh up to 150 lbs.
  2. Females weigh 90-120 lbs.
  3. Height at shoulders is 30-32 inches.
  4. They are used to guard livestock in Turkey.
  5. They were bred to be independent thinkers.

With their large size and protective instincts, Kangal Shepherds require training and socialization from an early age. Secured fences are a must, as they will patrol the perimeter. Like other giant breeds, Kangals are gentle with family but wary of strangers.

Their loyalty and devotion make them wonderful companions for experienced owners.

We’ll shift our focus next to more mammoth canines like the Newfoundland, Mastiff, and Great Dane.


Keep chuggin’ along, big fella. Your courage inspires us all, like a majestic ship sailin’ troubled waters. As a Newfoundland owner, you know their massive size comes with special transportation needs.

Their grooming requires regular brushing and bathing to keep that gorgeous coat healthy.

With an average lifespan of 9-10 years, provide excellent veterinary care to catch issues early. Common issues in large breeds include hip and elbow dysplasia, so optimal nutrition and exercise are important to prevent excess weight straining the joints.

Adequate space is essential for these gentle giants to stretch out indoors and out. Their working dog roots make them loyal companions who aim to please their people. Continue providing the love and care that keeps your Newfoundland feeling like the cherished family member they are.

Neapolitan Mastiff

Neapolitan Mastiff
You’re looking at the Neapolitan Mastiff next, one of the world’s biggest dog breeds that can weigh over 150 pounds fully grown. They make quite the impression with their massive, wrinkled heads and intimidating appearance, though they’re gentle protectors at heart.

Let’s learn more about these gentle giants who capture our fascination with their sheer size and stature.

  1. Costly food bills to meet high calorie needs
  2. Digestive issues like bloat
  3. Joint pain and mobility limitations
  4. Shortened life expectancy of 7-9 years
  5. Overheating risks requiring temperature regulation

Weighing between 130-150 pounds, these intimidating yet affectionate dogs require special care and expenses due to their structure and size. But their gentle, protective nature makes them a beloved companion for the right owner.

Irish Wolfhound

Irish Wolfhound
You may be surprised to learn that the Irish Wolfhound ranks among the largest breeds, despite its lesser fame compared to the Mastiff or Great Dane. Though more slender and agile than other heavyweights, these tall hounds astound with their formidable size.

They stand over 7 feet on their hind legs and tower nobly over most humans. Yet their sweet nature belies their ability to take down wolves and formidable prey in their early days. Today’s Wolfhounds thrive as majestic yet gentle companions. Their striking presence and devoted loyalty make them ideal guardians of home and family.

Though reserved with strangers, they bond intensely to their owners. Their short lifespan of just 6-8 years remains an Achilles’ heel for the breed. Nonetheless, their gentleness and short coat endear them to many seeking a low-maintenance giant breed.

If you crave an imposing yet easygoing companion, the Irish Wolfhound may be the giant breed for you.

Caucasian Shepherd Dog

Caucasian Shepherd Dog
Strut that massive frame, Fido, ’cause you’re the chubbiest canine in town.

Originating high in the Caucasus Mountains as a guard dog, protecting livestock from predators and poachers, your ancestral origins belie your cuddly appearance.

Don’t be fooled by that thick fur and droopy face – this is a working breed through and through.

Ever watchful, fiercely loyal, and weighing in at a scale-tipping 200 pounds, you exemplify the Caucasian Shepherd Dog standard.

While not quite as massive as your English Mastiff and Neapolitan Mastiff cousins, your imposing size and strength demand respect.

Whether herding sheep in your mountainous homeland or snuggling on the couch, you bear your hefty bulk with dignity.

Stay fluffy, Fido!


The Leonberger is quite the character. With their friendly, playful nature and huge size, they make a big impression everywhere they go. Despite their intimidating stature, Leonbergers have a mild temperament and enjoy being around people.

While not as heavy as some mastiff breeds, Leonbergers can reach impressive sizes.

  • Average Weight: 120-170 lbs
  • Average Height: 27-32 in
  • Breed: Tibetan Mastiff
    • Average Weight: 140-170 lbs
    • Average Height: 26-29 in
  • Breed: Great Dane
    • Average Weight: 120-200 lbs
    • Average Height: 28-32 in
  • Breed: English Mastiff
    • Average Weight: 120-230 lbs
    • Average Height: 27-30 in
  • With their large and lovable personalities, it’s easy to see why the Leonberger continues to charm people today. Proper care and training are essential for these gentle giants to reach their full potential as companions.

    But their playful spirit and friendliness make them wonderful additions to many families.

    The Leonberger’s size may be formidable, but their heart is truly gentle.

    Great Dane

    Great Dane
    Y’all’d be surprised to learn these gentle giants can reach such sizable proportions.

    Though the world’s heaviest dog breeds like English Mastiffs and Saint Bernards outweigh Danes, these enormous gentle beasts still rank among the largest. Male Danes typically reach 30 inches tall and weigh 120-200 pounds. Though their commanding presence and cool dog pictures portray them as intimidating, they’re total softies.

    With proper exercise and a healthy Great Dane diet, these mellow mutts live 6-8 years.

    So consider adopting or fostering one of these lovable legends if you’ve got space to spare! Their massive size just means more drool and slobbery kisses to enjoy.

    Frequently Asked Questions (FAQs)

    What is the current Guinness World Record holder for the heaviest/fattest dog?

    Fellow canine lover, meet Zorba the mastiff. Zorba claimed the prestigious Guinness World Record for the heaviest dog in 1989, tipping the scales at a whopping 5 kilograms! Though he’s sadly passed on, Zorba’s legendary heft remains unmatched.

    Perhaps someday another huggable hound will waddle in to steal the title. For now, Zorba reigns supreme as the fattest dog in recorded history.

    What health problems are caused by obesity in dogs?

    As your best friend packs on the pounds, so does the pressure on their joints, heart, and lungs. Excess weight strains their body, leaving them prone to diabetes, arthritis, breathing issues, and even shorter lifespans.

    But with your help and care, their scale can tip back towards health through proper diet and exercise.

    What is the average lifespan of an obese dog compared to a healthy weight dog of the same breed?

    You’re looking at a lifespan cut nearly in half for Fido when he packs on too many pounds. An obese dog’s clock starts ticking faster, their life is shortened by all that extra weight straining their body.

    But with a proper diet and exercise, they can shed the pounds and add years back to their life.

    How much should I feed my large breed puppy per day to avoid obesity?

    To avoid obesity, feed your large breed puppy 2-3 cups per day, split into 2-3 meals. Start with the low end to avoid the health risks of overfeeding. Adjust the amounts depending on the body condition; the ribs should be felt but not seen.

    Stay consistent with a slow-growth diet as rapid gains can spur joint issues. Bond through healthy activities, not just treats.

    What exercises can I do with my overweight large breed dog to help them lose weight?

    Walk your dog daily, starting slowly and gradually increasing duration. Monitor their weight weekly and adjust food portions as needed. Some easy exercises include swimming, which is low-impact, and playing fetch, which gets them running.

    Be patient and celebrate small milestones. With time and consistency, your dog will be healthier and happier.


    You’ve explored the truth about some of the heaviest dog breeds on Earth. While their massive size was once crucial to their purpose, today’s gentle giants simply need proper care to ensure their health.

    Providing an adequate diet, exercise, and veterinary supervision allows these loyal companions to thrive at a healthy weight. With some adjustments from their human caretakers, even the fattest dogs can comfortably carry their big frames.

    At the end of the day, every dog deserves to live their best life with responsible pet parents guiding the way.

    Avatar for Mutasim Sweileh

    Mutasim Sweileh

    Mutasim is an author and software engineer from the United States, I and a group of experts made this blog with the aim of answering all the unanswered questions to help as many people as possible.