Giants Among Us: The Biggest Dogs and What You Need to Know

When it comes to choosing a canine companion, biggest dogs capture hearts in a unique way. Their sheer size combined with surprisingly gentle temperaments makes them irresistible to many dog lovers. But before bringing one of these massive companions home, potential owners should understand what it truly means to live with one of the biggest dogs in the world.

Why Biggest Dogs Make Exceptional Companions

According to the American Kennel Club, most of the biggest dogs fall within the working group—breeds originally developed to perform demanding tasks like pulling sleds, guarding estates, and protecting families. “Breeds in the working group tend to be known for imposing stature, strength, and intelligence,” notes the AKC. These giant animals inherit the drive and instincts their ancestors were bred for, making them fundamentally different from smaller breeds.

Pet care expert Charlotte Reed emphasizes that “owning one of the biggest dogs can be a wonderful experience as long as a potential owner is prepared. These massive breeds continue to maintain the drive they were originally bred for, along with their working instincts—which means they’re not for everyone.”

The Reality Check: What Comes With Owning One of the Biggest Dogs

Life with biggest dogs requires serious preparation across several key areas:

Development and Health Considerations

Giant breeds develop at a different pace than smaller dogs. “Bigger dogs tend to mature and develop slower than other breeds, both mentally and physically,” requiring extra caution during their joint development phase. Young biggest dogs can injure themselves more easily during growth spurts, making careful management essential during their first 12 to 24 months.

According to Dr. Jessica Hess, a veterinarian and owner of GoodVets in Golden, Colorado, most large breed dogs reach their adult height by 12 to 18 months, while truly giant breeds like Great Danes, Mastiffs, and Newfoundlands may continue growing until age 2 or beyond. Interestingly, even after height plateaus, biggest dogs continue filling out and gaining muscle mass.

Space, Nutrition, and Living Requirements

Biggest dogs need appropriately sized accommodations. Large beds, oversized food and water bowls, and spacious living areas become non-negotiable. These animals require room to move freely without feeling cramped—apartment living may not suit all biggest dogs, regardless of how well-behaved they are indoors.

Financial Commitment

The financial reality of biggest dogs is substantial. Beyond expensive toys and larger food quantities, veterinary costs for giant breeds significantly exceed those for smaller dogs. Routine check-ups, preventative care, and emergency treatment all come with premium price tags. Pet insurance for biggest dogs also typically costs more than coverage for standard-sized breeds.

Training and Behavioral Management

Proper training becomes absolutely critical with biggest dogs. Behaviors overlooked in smaller breeds—like jumping on people or pulling on the leash—become genuinely dangerous with animals weighing 150+ pounds. Early socialization and consistent behavioral training are not optional luxuries but essential requirements.

The Complete List of 20 Biggest Dogs Explained

1. Mastiff

The mastiff represents the quintessential gentle giant. These dogs can reach a staggering 230 pounds and stand 30 inches tall, with some individuals growing even larger. Despite their intimidating size, mastiffs are remarkably docile, obedient, and deeply attached to their families. Their broad, muscular build and distinctive wrinkled faces make them both impressive and oddly endearing. Loyalty runs deep in the mastiff bloodline—they protect their families with quiet, unwavering devotion.

2. Boerboel

Originating from South Africa, the boerboel emerged from centuries of cross-breeding between large guard dog breeds brought by Dutch and German settlers in the mid-1600s. The name derives from the Dutch word “Boer,” meaning farmer. These athletic, robust dogs were originally deployed for big game hunting and farm protection. Modern boerboels maintain their protective instincts and devoted nature, remaining exceptional guardians of their families.

3. Tosa Inu

Japan’s mastiff, the Tosa Inu, carries a fascinating history as a fighting breed from Shikoku island. Developed through deliberate crosses involving Shikoku Inu, mastiffs, bulldogs, Great Danes, and German pointers, the breed achieved status in Japan comparable to respected sumo wrestlers. These biggest dogs display a stoic, patient exterior while harboring deep family affection. Though reserved with strangers, their vigilant nature makes them outstanding home guardians.

4. Saint Bernard

The Saint Bernard embodies the “gentle giant” archetype. These Swiss Alps natives combine massive heads, deep-set eyes, and characteristic droopy jowls into an unforgettable appearance. Legendary for their mountain rescue missions through treacherous Alpine passes, Saint Bernards possess remarkable strength, endurance, and directional instinct. Their patient, kind-hearted temperament extends naturally to family life, making them beloved household members.

5. Great Dane

Often called the “Apollo of dogs,” the Great Dane stands as one of the tallest dog breeds, originating from Germany. These majestic animals can reach 32 inches at the shoulder and weigh nearly 200 pounds—tall enough to meet humans eye-to-eye when standing on hind legs. Despite their imposing stature, Great Danes crave companionship and affection, thriving as family pets. Interestingly, Dr. Linda Simon notes that Great Danes rank among the laziest biggest dogs, loving to lounge rather than pursue athletic endeavors.

6. Leonberger

This German-bred beauty combines handsome features with gentle temperament. Leonbergers showcase powerful builds beneath thick double coats, with males reaching up to 170 pounds. Known for remarkable intelligence and eagerness to please, they excel in obedience training and therapeutic work. Their calm, patient nature particularly shines in water rescue operations—these biggest dogs prove both beautiful and functionally skilled.

7. Neapolitan Mastiff

Italy’s contribution to the biggest dogs category, the Neapolitan mastiff commands attention through sheer mass and distinctive wrinkled skin. These powerful companions develop profound bonds with their families, radiating sweet and loving temperament despite their imposing appearance. Notably, Neapolitan mastiffs prefer calm, easygoing lifestyles with abundant lounging time—they’re not built for marathon-like activity levels.

8. Newfoundland

Originally from Canada, the Newfoundland combines friendly disposition with remarkable swimming ability. Their thick, water-resistant coat and webbed feet make them exceptional aquatic athletes, capable of rescuing drowning individuals. Patience and gentleness with children define their character. Fair warning: Newfoundlands drool substantially, but their calm, well-behaved nature and devotion to family make them outstanding additions to the right households.

9. Anatolian Shepherd

This Turkish breed epitomizes strength and protective capability. Anatolian shepherds developed through centuries of livestock guarding duty, inheriting exceptional intelligence and independent judgment. Their sturdy build and thick coat enable functioning in diverse weather conditions. While more serious in demeanor than some biggest dogs, they demonstrate surprising gentleness and affection toward their own families.

10. Tibetan Mastiff

Originating from Tibet’s mountains, the Tibetan mastiff strikes an imposing silhouette with its thick, fluffy coat and commanding presence. These biggest dogs are known for their loyalty, protective instincts, and distinctively deep bark—all attributes making them formidable guardians. Though reserved with strangers, they display genuine tenderness toward family members, representing classic working dog temperament.

11. Rottweiler

Originally from Germany, the rottweiler’s sleek black coat with tan markings masks a surprisingly gentle nature. These intelligent, easily trained biggest dogs excel at guard work due to their protective instincts and trainability. Despite their tough exterior reputation, rottweilers form deep bonds with their families and thrive on companionship. Regular exercise and socialization prove essential for their psychological well-being.

12. Bullmastiff

England produced this powerful guardian breed, originally developed to protect sprawling estates. The Bullmastiff combines intelligence with calm temperament and natural protective instinct. Their muscular build conveys strength, yet they prove capable of remarkable gentleness with loved ones. With appropriate training, exercise, and socialization, bullmastiffs evolve into devoted, loving companions.

13. Akita

This loyal Japanese breed showcases independence and remarkable courage. Akitas possess powerful builds with thick double coats insulating them against cold weather. Known for strong protective instincts and intelligence, these biggest dogs sometimes display stubborn tendencies. While reserved around strangers, they demonstrate staunch loyalty and affection within their family unit, making them excellent lifetime companions.

14. Black Russian Terrier

Developed in Russia, the black Russian terrier combines strength and confidence in a densely coated package, typically appearing in black or dark gray. These intelligent, loyal biggest dogs excel at guard work but require consistent guidance and socialization. Beneath their formidable appearance lies capacity for genuine gentleness with family members. Mental stimulation and regular exercise are vital for their development.

15. Irish Wolfhound

Ireland’s contribution to the biggest dogs category, the Irish wolfhound pairs majestic stature with gentle temperament. One of the tallest breeds, these animals boast thin, athletic builds and characteristic wiry, shaggy coats. Their friendly, kind nature creates excellent family dynamics. Irish wolfhounds embody calm, good-natured personalities coupled with deep loyalty.

16. Great Pyrenees

Hailing from French mountains, the Great Pyrenees showcases a distinctively thick, fluffy white coat serving practical insulation purposes. These loyal, watchful biggest dogs excel as protective guardians while maintaining gentle, patient dispositions. Excellent with children and other animals, Great Pyrenees thrive in cooler climates where their thick coats remain advantageous. Regular grooming becomes essential maintenance.

17. Scottish Deerhound

This Scottish breed combines graceful athleticism with gentle temperament. Scottish deerhounds possess slender, athletic builds and shaggy coats displaying various colors. Historically deployed for deer hunting, these biggest dogs retain high exercise requirements and substantial space needs. Their friendly, mild-mannered nature extends well toward children and other animals.

18. Bernese Mountain Dog

The Bernese mountain dog originates from the Swiss Alps, showcasing sturdy, powerful builds beneath distinctive tricolored coats. These biggest dogs combine gentle, patient nature with exceptional family compatibility. Their love for outdoor activities makes them ideal for active families, though they prefer cooler climates. Mental stimulation and regular exercise support their overall well-being.

19. Dogue de Bordeaux

France’s Dogue de Bordeaux, also known as the French Mastiff, presents a powerful silhouette with muscular build and characteristic wrinkled skin. These biggest dogs demonstrate calm, gentle nature while remaining fiercely devoted and protective. Though their appearance intimidates, they typically display good-natured, patient temperament—particularly with children. Early socialization remains crucial.

20. Cane Corso

Italy’s cane corso represents strength and protective capability combined in an athletic frame. These intelligent biggest dogs respond exceptionally well to training, driven by inherent eagerness to please. Their muscular, athletic build supports their guardian role, yet they express genuine gentleness and affection within family settings. Early socialization with people and other dogs proves essential for balanced development.

Making the Right Choice When Considering Biggest Dogs

Selecting biggest dogs for your family requires honest self-assessment. These animals demand commitment to joint health during critical development periods, substantial financial investment, adequate living space, and consistent behavioral training. They’re not suitable for every household, despite their undeniable appeal.

However, for families prepared to meet these requirements, biggest dogs offer unparalleled loyalty, protection, and companionship. The financial investment, space requirements, and training demands pale in comparison to the love and devotion these gentle giants provide throughout their lifespans.

Frequently Asked Questions About Biggest Dogs

Which of the biggest dogs ranks as the laziest?

Veterinary experts disagree somewhat. Dr. Linda Simon notes that Great Danes top her list of laziest biggest dogs—they genuinely prefer lounging to athletic pursuits. However, Dr. Sabrina Kong argues the Bullmastiff deserves this distinction due to characteristically low energy levels and affinity for lounging around homes.

Do any of the biggest dogs have lower shedding levels?

While all dogs shed to some degree, certain biggest dogs shed less prolifically. Dr. Linda Simon identifies the Cane Corso and Doberman as moderate shedders among the giant breed category.

At what age do the biggest dogs stop growing?

Most large breeds reach adult height by 12 to 18 months. However, truly giant breeds like Great Danes, Mastiffs, and Newfoundlands may continue gaining height until 2 years or beyond. Even after height stabilizes, biggest dogs continue filling out and gaining muscle mass.

Can paw size predict how big biggest dogs will become?

Genetics determines the ultimate size of biggest dogs more than any other factor. While veterinarians sometimes use puppy paw size as a rough growth estimate—particularly for shelter or rescue animals—this method proves far from perfect. Actual adult size depends primarily on breed genetics and individual variation.

Final Thoughts on Living With Biggest Dogs

Owning one of the biggest dogs represents a significant life commitment extending far beyond their impressive physical dimensions. Success requires genuine preparation addressing their unique developmental needs, nutritional requirements, medical care, and behavioral training. The reward for this dedication manifests in the form of extraordinarily loyal, loving family members who enrich lives with their steadfast devotion and gentle nature.