Giant dog breeds are famous for their size, strength, and gentle personalities, but they also come with very specific care needs. In this guide, you’ll learn which breeds rank among the biggest dogs in the world, what makes them unique, and how to care for a giant breed safely and responsibly. You’ll also get practical advice on feeding, exercise, grooming, health risks, training, costs, and family life, plus answers to the most common questions people ask before bringing home a giant dog.
Table of contents
Introduction
What counts as a giant dog breed
The 10 biggest dog breeds
How to care for giant dogs
Health problems to watch for
Training and socialization
Living with giant breeds
FAQs
Conclusion
Introduction
If you’ve ever stood next to a Great Dane, Mastiff, or Saint Bernard, you already know the feeling: these dogs don’t just enter a room, they own it. Giant dog breeds are impressive, loyal, and often surprisingly affectionate, but they are not “big dogs with big hearts” alone; they also need careful feeding, controlled exercise, joint support, and smart health planning from day one. Giant breeds often mature more slowly, live shorter lives than smaller dogs, and face special risks such as bloat and orthopedic disease, so choosing one means understanding both the reward and the responsibility.
What makes a dog giant
A giant breed is usually defined by a combination of height and weight, not just one or the other. In practical terms, these are dogs that commonly weigh well over 40 kg and often stand close to or above 70 cm at the shoulder, depending on breed and sex. Many of the most famous giant breeds were developed for guarding, hunting, pulling carts, or working in harsh climates, which explains their power and stamina.
Most giant breeds belong to the Working Group, where they were originally bred for demanding jobs such as guarding, rescue, livestock protection, and cart pulling. If you’re curious about how giant breeds fit into the wider canine classification system, read our guide on The 7 Types of Dogs: A Complete Guide to Dog Classification.
Giant dogs are not the same as merely “large” dogs. A Labrador is big, but a Mastiff or Newfoundland changes the way you plan space, food, transport, vet care, and even furniture. That is why the biggest dog breeds require a different level of preparation from the average household pet.
The 10 biggest dog breeds
Below are ten of the largest dog breeds in the world, based on commonly recognized size ranges and breed descriptions from major canine references.
1. English Mastiff
The English Mastiff is widely regarded as one of the largest dog breeds in the world, and in many lists it is the breed most associated with sheer mass. Males commonly stand around 30 inches or more and can weigh from 160 to 230 pounds, while females are usually smaller but still massive. Despite the size, they are often calm, patient, and deeply loyal.
2. Irish Wolfhound
The Irish Wolfhound is one of the tallest breeds on earth and is known for its elegant, rough-coated frame. These dogs are built for height and speed rather than bulk, but they still belong firmly in the giant category. If you want a giant dog with a more athletic look, this breed is one of the most iconic choices.
3. Saint Bernard
Saint Bernards are famous for their rescue history in the Swiss Alps, and they remain one of the most recognizable giant dogs worldwide. Their size, thick coat, and strong build make them powerful companions, but they also need careful grooming and weight control. They are usually affectionate and steady, which is part of their broad family appeal.
4. Newfoundland
The Newfoundland is a giant working breed originally bred for water work, and its powerful chest and heavy coat make it stand out immediately. Newfoundlands are known for their gentle nature and swimming ability, but their coat also means more grooming and more shedding. If you want a giant dog with a calmer temperament, this breed often appears near the top of that conversation.
5. Dogue de Bordeaux
The Dogue de Bordeaux is a muscular French mastiff with a famously broad head and strong body. It is not the tallest giant breed, but its dense build and heavy frame place it among the biggest dogs in the world. The breed is protective, devoted, and best suited to an owner who understands confident, consistent handling.
6. Leonberger
The Leonberger was developed as a large, noble-looking companion and working dog, and it combines size with a balanced, athletic shape. Its long coat and heavy frame mean regular grooming and plenty of attention to joint health. This breed often appeals to people who want a grand-looking giant with a more family-friendly temperament.
7. Anatolian Shepherd
The Anatolian Shepherd is a powerful livestock guardian breed with serious strength and endurance. It was built to work independently in demanding conditions, so it is not a casual pet choice. For the right owner, though, it can be an excellent guardian with deep loyalty and remarkable stamina.
The Anatolian Shepherd is one of several breeds originally developed for demanding jobs. Learn more about what separates true working dogs from ordinary companion dogs in our guide to What Is a Working Dog? Traits, Breeds & K9 Careers Guide.
8. Neapolitan Mastiff
The Neapolitan Mastiff is instantly recognizable for its loose skin, massive head, and heavy presence. It is one of the most imposing giant breeds, and its guarding instincts are strong. That said, the breed needs structured training and early socialization to make sure its power is matched by control.
9. Great Dane
The Great Dane is one of the most famous giant breeds in the world and is often called the “Apollo of dogs” because of its height and elegance. Guinness World Records has repeatedly identified Great Danes as record holders for tallest dog, including Zeus, who measured 1.118 m, or 44 inches, tall. Great Danes are loving, sensitive, and often more couch-potato than athlete, but their size demands special care.
10. Tibetan Mastiff
The Tibetan Mastiff is a historic guardian breed known for its thick coat, independence, and powerful build. It was bred to protect livestock and property in harsh mountain environments, which explains both its strength and its cautious temperament. This is a giant breed for experienced owners who respect boundaries and invest in training.
How to Care for Giant Dogs
Caring for giant dog breeds is not just about feeding more food. It is about managing growth, protecting joints, preventing emergency conditions, and making sure the dog is emotionally and physically balanced as it matures.
Feeding giant dogs
Large and giant breed puppies need special nutrition because rapid growth can put stress on bones and joints. That means you should avoid overfeeding and avoid diets that are not designed for large-breed growth. Vets and nutrition specialists generally recommend controlled calorie intake, measured meals, and a diet formulated for large-breed puppies rather than a generic puppy food.
While giant breeds have unique nutritional requirements, many of the same principles used to fuel high-performance working dogs, balanced protein, controlled growth, and proper joint support also apply. Our guide on Best Nutrition and Health Tips for Working Dogs explains these feeding principles in greater detail.
A simple feeding rule helps a lot:
Use a large-breed puppy formula during growth.
Feed measured portions instead of free-feeding.
Keep body condition lean.
Adjust food based on age, activity, and vet guidance.
Exercise and movement
Giant breeds still need exercise, but their exercise must be thoughtful. AKC guidance notes that large-breed puppies need exercise, but because bones and joints are still developing, excessive jumping, hard surfaces, and forced running can be risky. For adult dogs, regular activity is important for weight control, muscle tone, and mental health.
Good exercise for giant dogs includes:
Daily leash walks are one of the safest forms of exercise for giant breeds, but teaching a 70-kilogram dog to walk politely starts long before adulthood. If your dog pulls or lunges, follow our complete guide on How to Train a Dog to Walk on a Leash before increasing exercise intensity Controlled play sessions.
Swimming, where appropriate.
- Basic obedience drills.
- Gentle hill work once the dog is fully mature.
- Grooming and coat care
Grooming needs vary widely among giant breeds. A smooth-coated Mastiff may require less coat work than a Newfoundland or Leonberger, but every giant dog benefits from routine brushing, nail trimming, ear cleaning, and dental care. Heavy-coated breeds can shed a lot, especially seasonally, so grooming is not optional if you want to keep the coat and skin healthy.
Space and home setup
You do not always need a mansion for a giant dog, but you do need practical space. Oversized beds, sturdy bowls, wide walkways, strong leashes, and a vehicle that can comfortably transport the dog all matter. One of the most common mistakes is underestimating how much room a 70-kilo dog really takes once it decides the sofa is its territory.
Health Problems to Watch For
Giant dog breeds tend to have shorter average lifespans than smaller breeds, and health issues often revolve around joints, heart function, and digestive emergencies. One study of giant breeds found an average lifespan of 7.60 years, with females living longer on average than males, and bloat and osteosarcoma among the leading causes of death.
Bloat and GDV
Bloat, or gastric dilatation-volvulus (GDV), is one of the most serious risks for giant and deep-chested dogs. It can become life-threatening very quickly, so it is a true emergency. Research and veterinary reporting repeatedly identify large barrel-chested breeds like Great Danes among the high-risk dogs for this condition.
Helpful prevention habits include:
Feeding smaller meals.
Avoiding heavy exercise right before and after meals.
- Using slow-feeder bowls if your dog eats too quickly.
- Watching for a swollen abdomen, restlessness, drooling, or retching.
- Joint and bone issues
Because giant breeds carry so much body mass, hips, elbows, and shoulders can become stressed over time. Large-breed puppies are especially vulnerable if they grow too fast or gain excess weight. Keeping your dog lean is one of the best long-term health decisions you can make.
Cancer and heart disease
Some giant breeds are also more likely to face cancers such as osteosarcoma, and heart problems can become more common as they age. This is one reason regular vet visits matter so much. Waiting until a giant dog is visibly ill often means you are already behind.
Training and Socialization
Training a giant dog is not optional; it is one of the biggest safety tools you have. A 70-kilo dog with poor leash manners can be a real risk even if it is friendly, so early obedience and socialization should start as soon as the puppy comes home.
Giant breeds naturally possess powerful instincts, but good ownership is about balancing those instincts with reliable obedience. Our article on Dog Obedience vs. Instinct: How to Balance Drive and Control explains how experienced handlers build calm, dependable dogs without suppressing their natural temperament.
What to teach first
Start with:
Name response.
Sit, down, stay, and come.
Loose-leash walking.
Calm handling for grooming and vet exams.
Leave it and drop it.
Why early training matters
Giant dogs often mature slowly, and AKC notes that many do not reach emotional maturity until around 2 to 3 years of age. That means the puppy stage can last longer than people expect, even after the dog is already huge. If you have ever had a 90-pound adolescent who still thinks it is a lap dog, you know exactly why consistency matters.
Real-world example
Great Danes are a perfect example of why training and care must go together. Guinness has documented multiple Great Danes as the world’s tallest living dog over the years, including Zeus and more recently Reggie, showing just how extreme the breed’s height can be. A dog that tall can be gentle and friendly, but without training, simple things like greeting visitors or walking through a doorway become difficult.
Want Professional Handler-Level Training Advice?
Training a giant breed isn’t just about teaching commands, it’s about building control, confidence, and clear communication from puppyhood through adulthood. If you want to learn the same practical methods used by experienced K9 handlers, Beyond the Bark: Inside a Pro Handler’s Playbook for Raising the Ideal Dog provides step-by-step guidance on obedience, behavior, leadership, and developing a reliable companion. Whether you’re raising a Great Dane, Mastiff, Newfoundland, or any other breed, the techniques are designed to help you build a calm, well-mannered dog for life.
Get your copy here: BEYOND THE BARK — Inside a Pro Handler’s Playbook for Raising the Ideal Dog
Living with Giant Breeds
Life with a giant dog can be incredibly rewarding, but it changes your daily routine. You will think differently about furniture, flooring, travel, grooming, and vet bills. You also need to be realistic about strength: a giant breed must be able to walk calmly beside you, wait at doors, and settle in the home.
Are giant dogs good with families?
Many giant breeds are excellent with families when they are well bred, properly socialized, and trained. Breeds like the Newfoundland, Saint Bernard, and Great Dane are often described as gentle, while guardians like the Anatolian Shepherd or Tibetan Mastiff may be better for experienced handlers. The key is not just breed choice but matching temperament to household lifestyle.
Are giant dogs good with kids?
Yes, many giant breeds can be good with children, but supervision is essential because sheer size can lead to accidental knocks and rough contact even when the dog is being playful. A giant breed may be gentle in spirit but still physically overwhelming for a toddler. The safest setup is always dog training, child respect rules, and constant adult oversight.
Budget reality
Giant dogs usually cost more to feed, medicate, transport, and groom. Vet visits can also be pricier because anesthesia, imaging, and dosing often depend on body size. Before you bring one home, it is smart to budget for food, preventives, grooming tools, beds, crates, and emergency care.
Giant breed care checklist
Use this checklist if you are thinking about one of the biggest dog breeds in the world:
Choose a large-breed puppy formula.
Keep growth slow and steady.
- Book regular vet checks.
- Protect joints with controlled exercise.
- Train early and consistently.
- Prevent bloat risks.
- Groom on a schedule.
- Buy equipment designed for large dogs.
- Plan for a shorter lifespan than average.
Frequently Asked Questions
What is the largest dog breed in the world?
The English Mastiff is widely recognized as one of the largest dog breeds by mass, while the Great Dane is one of the tallest and most famous record-holders by height.
How long do giant dog breeds live?
Many giant breeds live about 7 to 10 years, and one study found an average lifespan of 7.60 years across giant breeds.
Are giant dogs harder to care for?
Yes, they usually are, because they need more food, stronger equipment, joint protection, more grooming in some breeds, and extra attention to training and health monitoring.
Do giant dogs eat a lot?
Yes, but the bigger issue is not just quantity; it is the quality and balance of the diet. Large-breed dogs should be fed in controlled portions to support healthy growth and reduce health risks.
Are giant dog breeds good with kids?
Many giant breeds are good with kids, especially calm breeds like Newfoundlands, Saint Bernards, and some Great Danes, but their size means supervision is always important.
Conclusion
Giant dog breeds are unforgettable, but they are not impulse pets. If you choose one of the biggest dog breeds in the world, you need to think beyond size and plan for nutrition, training, exercise, grooming, health checks, and the reality of a shorter lifespan. The best giant dog owners are the ones who respect the dog’s size from day one and build a routine around safety, structure, and consistency.
If you care for a giant breed the right way, you get a companion that is powerful, loving, and genuinely one of a kind. The smartest move is to match the breed to your lifestyle, keep your dog lean, train early, and work closely with a vet who understands large-breed care.