Giant dog breeds are generally classified based on average adult height and weight ranges.
Giant breeds weigh over 100 lbs. Their development happens in two phases—bone growth first, followed by muscle. They reach adulthood around 24 months. Lean growth is important to avoid joint and bone disorders. Calcium supplements should be avoided as they may contribute to deformities.

The St. Weiler is a sizable breed, usually weighing between 80 and 100 pounds. This hybrid dog is created by crossing a Saint Bernard with a Rottweiler. St. Weilers are recognized for their affectionate and loyal demeanor, as well as their protective, calm, and friendly traits. Similar to their Saint Bernard lineage, they have a tendency to drool and shed a moderate amount of fur. To prevent excessive weight gain, it is crucial to provide them with regular exercise to ensure their health and fitness. These dogs serve as excellent protectors of property, alerting their owners to any potential threats. Moreover, they can be fantastic family pets, particularly when they are socialized with children from an early age.
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This ancient breed exudes a sense of strength and authority. Hailing from the rugged Caucasus Mountains, which lie between Europe and Asia, it is known by several names, the most common being the Caucasian Ovcharka or Caucasian Shepherd. These large dogs were originally bred to protect sheep from various threats, both human and animal. As a result, the temperament of the Caucasian Mountain Dog can vary widely. They can be affectionate and gentle with their families or, conversely, display aggressive and unruly behavior. The key to their demeanor often lies in the owner's approach to training, which should strike a balance between firmness and compassion. While their protective nature can be appealing, this breed may not be the best choice for inexperienced dog owners. Although these large, fluffy dogs were initially intended for guarding flocks, they are increasingly being kept as family pets. Nonetheless, their aggressive and protective instincts have historically hindered their popularity. As interest in the Caucasian Mountain Dog continues to rise, it is likely that selective breeding efforts will focus on moderating their overly protective traits.
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The Greater Swiss Mountain Dog, commonly known as the Swissy, is a gentle and affectionate breed that delights in making its owners happy. Although they are intelligent and can sometimes be a bit headstrong, their steadfast loyalty more than makes up for these tendencies. Generally, they are calm around children, other animals, and friendly guests, but they also make excellent watchdogs thanks to their sharp awareness. Originating from Switzerland, this breed has a rich history that dates back nearly 2,000 years, making it one of the oldest dog breeds in the country. Originally developed for herding, guarding, and draft work, the Greater Swiss Mountain Dog has transformed into a versatile companion, thriving in various activities such as competitive obedience, carting, tracking, and protection.
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The Golden Newfie is a large breed that can be categorized as either large or giant, depending on the genetic characteristics inherited from its parent breeds. Renowned for their serene temperament, patience, and gentle disposition, Golden Newfies are wonderful family pets, offering both protection and affection. These amiable and sociable dogs generally coexist well with other animals, including cats, particularly if they are socialized early on. Although they have a tendency to drool, they also love to swim as a means of cooling down. Training should be conducted with a calm and consistent approach, as these dogs are sensitive to vocal cues and can easily pick up on any signs of frustration. Playful, loyal, and dependable, the Golden Newfie is a confident breed that adapts effortlessly to family life.
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The Dogue de Bordeaux, commonly referred to as the French Mastiff, is a sizable breed with a lineage that remains somewhat ambiguous. Typically, these dogs stand around two feet tall at the shoulder and can weigh more than 99 pounds, distinguished by their prominent heads and short snouts. Unfortunately, they are susceptible to a range of health problems, including heart disease, various cancers, and hip and elbow dysplasia, which contribute to a relatively brief lifespan of five to eight years, though some may live longer. A notable case is Beasley, a nine-year-old Dogue de Bordeaux who appeared alongside Tom Hanks in the 1989 film "Turner and Hooch" and lived for three years beyond the film's release. If not properly socialized, these dogs can display stubborn and strong-willed tendencies, reminiscent of Hooch's character in the movie. However, with the right care and attention, they can develop into loyal, tolerant, and affectionate family companions.
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The Tosa is a sizable breed that was initially developed for dog fighting, recognized for its impressive looks and determined temperament. This breed is not ideal for novice dog owners, as it requires a skilled handler capable of establishing authority. Given its intricate background, the Tosa is not recommended for families with young children or other animals. It often displays aggression towards same-sex dogs and necessitates a sturdy, tall fence when outdoors without supervision. Continuous training is crucial to ensure the Tosa does not try to take control of the household hierarchy.
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The Kangal Dog, a large breed that resembles a Mastiff, originates from Turkey. This breed has traditionally served as a protector of livestock, safeguarding them from various predators. As a true livestock guardian, the Kangal is equipped with a natural protective instinct and thrives with early socialization. Unlike many other breeds in this category, Kangals are generally more friendly towards people and particularly enjoy being around children. It is crucial to have a strong fence, as these dogs do not recognize property boundaries and can cause considerable disruptions in the neighborhood if not properly contained. Furthermore, the Kangal may show aggression towards other dogs and can be defensive when unfamiliar individuals approach their territory.
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The Mountain Mastiff is a hybrid breed resulting from the combination of a Bernese Mountain Dog and a Mastiff. Weighing in at an impressive 150 to 200 pounds, these dogs are notable for their large stature. However, what truly sets them apart is their affectionate, gentle, and loyal nature towards their families. As guardians, their size and inherent caution around strangers equip them well for protection duties. They also demonstrate skills in tracking and weight pulling. Although they are intelligent, their sensitivity necessitates a gentle training approach. These devoted companions flourish in a family setting, making them exceptional pets.
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The New Rottland is an extraordinary hybrid breed that merges the traits of the Newfoundland and the Rottweiler. Both parent breeds are known for their large size and gentle demeanor, making them excellent family companions while also serving as dependable guard dogs due to their impressive stature and steadfast loyalty. Typically, these dogs weigh approximately 130 pounds and stand between 28 to 30 inches tall. The New Rottland boasts a dense, medium-length coat that often displays a mix of black, brown, fawn, and cream, reflecting the unique coloration of the Rottweiler combined with the Newfoundland's fur. Renowned for their intelligence and playful disposition, these dogs thrive on interaction with children and other pets, relishing activities such as fetching balls and sticks.
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The Grand Bleu de Gascogne is a large, ancient breed believed to have descended from dogs kept by the Gauls and Phoenicians. Recognized for their historical importance and genetic contributions, they are one of the two primary breeds that have influenced the development of many modern hound types over the last thousand years or more. These dogs are adept hunters, known for their slow and steady approach, yet they are methodical and efficient, having been used for centuries to track significant game like deer, wolves, and boar—aptly reflected in their name, "grand," which denotes their impressive targets. Traditionally, they have hunted in packs, which has cultivated a friendly nature and a remarkably strong, almost musical voice that facilitates communication among pack members and with hunters. With a well-balanced temperament, they are typically sociable and amiable at home, but they display a lively enthusiasm when out in the field. Regrettably, the decline of pack hunting—partly due to evolving needs and the expenses associated with such practices—has made the Grand Bleu de Gascogne a rare breed. Their population has significantly decreased during periods of conflict and continues to diminish in contemporary times. However, passionate breed advocates are striving to sustain their numbers, albeit on a small scale. While this breed originates from France, its near-cult following in the United States has led many to perceive that they are more prevalent and favored there than anywhere else in the world.
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The Labernard is a friendly, affectionate, and sociable breed, drawing its personality from its parent breeds: the energetic Labrador Retriever and the gentle Saint Bernard, both of which were originally developed for work purposes. This breed falls into the large to giant category and requires a firm and consistent training approach due to its stubborn nature; therefore, starting training early is recommended. Labernards come in a range of colors, such as white, yellow, brown, tan, black, and red, and possess a short, dense coat with a thick double layer that can lead to discomfort in warmer climates. They shed moderately, so regular grooming is essential to keep their coat healthy. With a strong need for physical activity, the Labernard makes an excellent companion for active families who enjoy outdoor pursuits.
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The hybrid breed created from the Bullmastiff and Neapolitan Mastiff is known as the Italian Bullmastiff by the Designer Canine Registry, while the American Canine Hybrid Club calls it the Neo Bullmastiff. This breed is quite large, typically exceeding two feet in height at the shoulder and weighing over one hundred pounds. Given their size, it is crucial to provide early socialization and training to foster their generally calm nature. However, their friendly temperament may not always extend to other dogs, particularly those that show aggression or encroach on their space. They may also inherit a tendency to chase smaller animals from their Bullmastiff ancestry. While their grooming and exercise requirements are relatively minimal, these dogs are very social and thrive on interaction with their families, necessitating significant attention to ensure their happiness and emotional well-being.
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