The first position on the list of the biggest dog breeds is the English Mastiff. Descended most likely from the ancient Alaunt and Pugnaces Britanniae, with a major 19th-century contribution from the Alpine Mastiff. The Mastiff is known for its friendly and loving temperament. It is distinguished by its gigantic size, massive head, short coat in a small range of colors, and always wearing a black mask.

It is the largest dog breed in terms of mass, with a hefty body, broad cranium, and often square-shaped head. Although there is a significant amount of mass overlap between these two breeds, it is often a little heavier than Saint Bernard. Despite being over six inches taller than the Irish Wolfhound and Great Dane, they are not nearly as robust.

Aicama Zorba of La Susa, an English Mastiff from England, held the title for the heaviest dog ever recorded at 155.6 kg, however, there have been claims of heavier dogs, including Saint Bernards, Tibetan Mastiffs, and Caucasian charkas. Zorba was about the size of a small donkey when he was 7 years old, standing 94 cm at the shoulder and 251 cm from the tip of his nose to the tip of his tail, according to the 1989 edition of the Guinness Book of Records. The Guinness Book of World Records ceased accepting records for the biggest or heaviest pets after 2000.

Weight

• Dogs: 73 to 104 kg
• Bitches: 54 to 77 kg

A big worker dog, the Newfoundland. They might be white, grey, brown, or black. Prior to joining the Canadian confederation, the Dominion of Newfoundland, however, only accepted black and Landseer (white-and-black) colored dogs as legitimate members of the breed. They were initially developed in Newfoundland as working dogs for fishermen. Newfoundlands are renowned for their enormous size, sharp intelligence, immense power, serenity, affection for youngsters, and loyalty. Because of their strong physique, thick double coat, webbed paws, and swimming prowess, they excel at water rescue and lifesaving.

Webbed paws and a waterproof coat are characteristics of Newfoundlands, sometimes known as "Newfs" or "Newfies." However, some Newfoundlands have been known to weigh over 90 kg (200 lb), and the largest on record weighed 120 kg and measured over 1.8 m (6 ft) from nose to tail, ranking it among the largest of dog breeds. Males typically weigh 65-80 kg, and females 55-65 kg, placing them in the "Giant" weight range. They can reach shoulder heights of 56–76 cm.

The Newfoundland's massive bones give it heft, and its large muscles give it the strength it needs to withstand choppy seas and strong tides. These dogs' enormous lung capacity allows them to swim for very long distances, and their thick, oily, and waterproof double coat shields them from the freezing water's chill. The dog sheds a lot and is difficult to groom because of the double coat. The dog drools, especially in the heat, due to the jowls and sagging lips.

Weight

• Dogs: 65–80 kg
• Bitches: 55–65 kg

The Italian Mastiff and simply "Neo" are other names for the Neapolitan Mastiff. This breed of dog was developed in Italy. This breed is now also referred to as the Italian Mastiff. The Tibetan Mastiff and the Indian Shorthaired Dog are the ancestors of the Neapolitan Mastiff. The Neapolitan Mastiff was originally intended to serve as a battle dog and provide protection for its owners. particularly throughout World War 2. Neo dogs made an early historical appearance. They are thought to have been given to Alexander the Great by the ruler of India. The Neapolitan Mastiff has been around throughout Europe ever since.

The Neapolitan Mastiff has a massive physique. A male adult dog may stand 65 to 75 cm tall and weigh 60 to 73 kg. Female dogs may range in height from 60 to 68 cm and weigh 50 to 60 kg as adults. Neo dog has the advantage of a huge physique and can win the majority of battles.

A Neapolitan Mastiff will have an average life span of 12-15 years. The thick skin of the Neapolitan Mastiff is an advantage that helps them limit damage when fighting. Therefore, NEo dogs were often used to participate in combat in the 40s of the last century.

Weight

• Dogs: 65-75 kg
• Bitches: 50-60 kg
  

One of the biggest dog breeds is the Irish Wolfhound which is a legendary sighthound dog breed from Ireland that has influenced literature, poetry, and mythology due to its presence and imposing size. Like all sighthounds, it was trained to hunt game quickly. It was also renowned as a guard dog, with a focus on wolf protection and wolf hunting.

Large size is a defining characteristic of the Irish Wolfhound. The minimum heights and weights for dogs and bitches, respectively, are 79 cm /54.5 kg and 71 cm /40.5 kg, as stated in the FCI standard. Expected heights at the withers vary from 81 to 86 centimeters. Compared to the Great Dane, it is bigger constructed than the Scottish Deerhound.

Irish Wolfhounds have a wide spectrum of characteristics and are frequently praised for their individuality and quirky personalities. However, despite their size and tendency to be heedless, Irish Wolfhounds are rarely known to be loud or destructive inside the home. This is due to the breed's characteristic introversion, intelligence, and reserve. The Irish Wolfhound is a calm creature by nature. When left alone for an extended period of time, wolfhounds can develop strong bonds with their family and become highly destructive or depressed.

Weight

• Dogs: minimum 54.5 kg
• Bitches: minimum 40.5 kg

A large breed of dog is the Leonberger. The German city of Leonberg in the Baden-Württemberg region is where the name of the breed is thought to have come from.

The temperament of this breed is one of its most significant and distinguishing qualities from other dogs, and it is the first and most significant attribute of the Leonberger breed. several types of dogs. As a result of interactions and training, Leonberger is assertive, indifferent to noise, subservient to family members, amiable with kids, appears calm to onlookers, and exhibits self-discipline when prompted with family or property claims.

The Leonberger is a huge, muscular, and attractive dog with a balanced body type, a medium temperament, and a dramatic presence. This breed occasionally has a generous double coat. A beautiful black mask that expresses the breed's unique expression of intelligence, pride, and kindness is worn on the head. The surprisingly nimble Leonberger is sound and coordinated, with both power in bearing and elegance in movement, staying true to their early roots as a capable family and working dog, as well as a search-and-rescue dog (especially in water). The Leonberger is a sexually dimorphic breed that can take on either a fiercely macho or gracefully feminine form, instantly indicating gender.

Weight

• Dogs: 54–77 kg
• Bitches: 45–61 kg

Large livestock guardians known as Caucasian Shepherd Dogs or Caucasian Ovcharkas are indigenous to the Caucasus region, specifically Georgia, Armenia, Azerbaijan, and Dagestan. It was created in the Soviet Union starting around 1920 using dogs from the Southern Russian steppe and the Caucasus Mountains. Historically, both in terms of quantity and the caliber of the dogs present, the Caucasus Mountains in Georgia have been the main location of dispersion for Caucasian Shepherd dogs.

Anytime there is a threat, it is a hardy, fearless, and self-assured dog with powerful bones and a sturdy build. If not, it's a loving, kind, and gentle dog that gets along well with everyone in the household as well as other animals. For many years, Caucasian Shepherds have been employed to protect cattle, property, and other things from predators like bears. Today, they are mostly kept as pets or watchdogs.

A big dog, the Caucasian Ovcharka is. For females, the recommended wither height is between 67 and 70 cm, and for males, between 72 and 75 cm. Female registration requirements are 64 cm and 40 kg, whereas male registration requirements are 68 cm and 50 kg. Caucasian Shepherd Dog is one of the biggest dog breeds.

Weight

• Dogs: minimum 50 kg
• Bitches: minimum 45 kg

The Komondor is a large, white-colored Hungarian breed of livestock guardian dog with a long, corded coat, often known as the Hungarian sheepdog. The Komondor dog breed, sometimes known as "mop dogs," is a well-known one that is frequently used to protect livestock and other types of property. The Cumans brought the Komondor to Europe, and the first written record of it dates to a 1544 Hungarian codex. A national asset of Hungary, to be safeguarded and shielded from alteration, is the Komondor breed.

One of the larger dog breeds is the Komondor, which is a massive breed with many standing over 30 inches (76 cm) tall. A thick, matted, corded coat is present all over the body. They have powerful, well-muscled bodies with long legs and a short back. A small curl is carried on the tail. When viewed from the side, the body appears to be lying in a rectangle. The length of the body is roughly 104 percent of the height at the withers, which is only a little bit longer than the height at the withers. The Komondor has a large head, a muzzle that is little under half the length of the head, and a consistent, full scissor bite. Black lips and a nose are a given. Komondor females on average weigh between 40 and 50 kg and Komondor males weigh on average between 50 and 60 kg.

Weight

• Dogs: 50–60 kg
• Bitches: 40–50 kg

The Great Dane is a domestic dog breed renowned for its size and calm temperament. Along with the Irish Wolfhound, the Great Dane is regarded as the tallest breed in the world. The Great Dane is currently the tallest dog in the world according to the Guinness Book of Records. The Great Dane was selected as Pennsylvania's official dog in 1965.

The Great Dane is thought to have first emerged in Ancient Greece around 3000 BC. It has since been discovered in Egypt, Rome, and temples in Babylonia. The Old English Mastiff could be the Great Dane's ancestor, and in addition to being crossed with the Irish hound, the Greyhound also passed along genes to the Great Dane.

They develop into the Mastiff breed's big, strong dogs. They are known as the "giants," and in addition to being employed for protection, towing, and tracking, they are powerful enough to take on bears, wild boars, and several other large animals.

The Great Dane is a large dog with a muscular and compact body that is not bulky, and it is recognized by the Guinness Book of World Records as the tallest dog in the world. They have sinewy, bulging calves, long, robust legs with straight forelegs, and exceptionally muscular rear legs. They can grow to a height of 71 to 86 cm and weigh 45 to 90 kg, depending on their state of maturity.

Weight: 45-90 kg

The next position on the list of the biggest dog breeds is the Tosa Inu. They are a rare breed of Japanese dog that are connected to many of the country's traditional cultural traits. This is a pretty fearsome dog breed, and several nations in Europe and North America, especially the UK, have strong laws governing it.

This dog breed is just about 200 years old and only emerged as a result of numerous crossbreeding. Its body and appearance differ from other Japanese breeds only in half. The Tosa is a huge, majestic-looking dog with incredible agility and dexterity. It is also incredibly flexible and robust. An adult Tosa is over 60 cm tall and weighs 40 to 90 kg, while some puppies can reach up to 105 kg.

The Tosa is an aggressive, courageous, and brave dog. It is particularly devoted to its owner, and members of the family are calm, peaceful, and hardly ever bark. Highly happy with the owner and very attentive to their voice. extremely quiet and composed, protective, and devoted. It is not essential to repeatedly train them because they are quite intelligent.

Height: 40-90 kg

The Scottish Deerhound, often known as the Deerhound, is a sizable sighthound breed that was originally developed for coursing red deer. The Scottish Deerhound resembles the Greyhound externally, but is larger, heavier-boned, and has a rougher coat.

The Scottish Deerhound looks like a greyhound with a rough coat. But its size and bone are bigger. Males should be at least between 39 and 50 kg; females should be at least weigh between 34 and 43 kg. One of the tallest sighthounds, it has a rough 7.6–10 cm long coat and mane, a beard and mustache that are a little softer, and softer hair on the breast and belly. It has little, dark "rose" ears that, unless held slightly upright in excitement, are soft and folded down against the head.

The Scottish Deerhound resembles the Greyhound externally but is larger and heavier boned. Deerhounds, however, stand out because of a variety of traits. On smooth, firm terrain, they can't outrun a Greyhound, but once the going becomes difficult or heavy, they can. The chilly, frequently rainy, and mountainous Scottish Highland glens, where they labored, contributed to the breed's bigger, rough-coated appearance. The Irish wolfhound and the Deerhound are closely related, and the Deerhound contributed to the development of the Irish wolfhound around the end of the 19th century.

Weight

• Dogs: 39-50 kg
• Bitches: 34-43kg