Neo Bullmastiff

The Neo Bullmastiff is a cross between the Bullmastiff and the Neapolitan Mastiff. Because each hybrid inherits a unique combination of traits from both parents, we recommend thoroughly researching both breeds before choosing a Neo Bullmastiff. Pay special attention to temperament, health issues, and care requirements, as your dog may express characteristics from either parent breed.

Bullmastiff

Bullmastiff

The Bullmastiff is a large, powerfully built dog that combines strength with agility, reflecting its heritage as a guardian bred to pursue and detain poachers on English estates. Males stand between 25 and 27 inches at the shoulder and weigh between 110 and 130 pounds, while females measure 24 to 26 inches in height and weigh between 100 and 120 pounds. The breed presents a nearly square appearance, with the body length being only slightly greater than the height. The chest is wide and deep, descending between the forelegs, with a well-developed forechest that contributes to the breed's powerful front assembly. The back is short and straight, creating a compact carriage without sacrificing activity or mobility. The Bullmastiff's head is large and wrinkled, with a broad, square skull that appears cubic when viewed from any angle. The muzzle is short and broad, measuring approximately one-third the length of the entire head, with well-defined cheeks and a moderate stop. The nose is black with large nostrils, and the eyes are dark hazel, set apart with a furrow between them that adds to the breed's characteristic expression of alertness and intelligence. The V-shaped ears are set high and wide on the skull, folding forward close to the cheeks and contributing to the square appearance of the head. A distinctive black mask covers the muzzle and extends around the eyes, enhancing the breed's imposing expression. The coat is short, dense, and weather-resistant, lying close to the body and providing protection without requiring extensive grooming. Acceptable colors are red, fawn, and brindle, with the darker brindle pattern appearing as tiger stripes over the base color. A small white marking on the chest is permissible, though extensive white is not desirable according to breed standards. The tail is set high, thick at the base, and tapers to the hocks, carried straight or curved but never carried hound-like. The breed moves with free, smooth, and powerful strides that cover ground efficiently while maintaining balance and coordination throughout.

Key Characteristics

Temperament
Temperament Temperament Temperament Temperament Temperament Temperament Training a Bullmastiff requires a confident, experienced owner who can provide consistent leadership without resorting to harsh methods. The breed is intelligent but can be stubborn and independent, sometimes appearing to weigh whether commands are worth following. They respond best to positive reinforcement and patient, firm guidance that establishes clear boundaries. Bullmastiffs are known for drooling, particularly after eating or drinking, and tend to snore due to their shortened muzzle. Their lifespan of 7 to 9 years is typical for giant breeds, and prospective owners should be prepared for the commitment of caring for such a large, devoted companion.
Health Considerations
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Gastric dilatation-volvulus, commonly known as bloat, is a life-threatening emergency that occurs more frequently in deep-chested breeds like the Bullmastiff. This condition requires immediate veterinary intervention and can be fatal within hours if untreated. Many veterinarians recommend preventative gastropexy surgery to reduce the risk. Entropion and progressive retinal atrophy can affect the eyes, while hypothyroidism impacts metabolic function. Cruciate ligament tears are common due to the breed's size and weight, often requiring surgical repair. Wobbler syndrome, a neurological condition affecting the spinal cord in the neck, can cause a characteristic unsteady gait in affected dogs.
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Neapolitan Mastiff

Neapolitan Mastiff

The Neapolitan Mastiff is a massive, heavy-boned dog that commands attention with its imposing size and distinctive appearance. Males typically stand between 26 and 31 inches at the shoulder and weigh around 150 pounds on average, though greater weight is common and acceptable as long as proper proportion is maintained. Some exceptional males may approach or exceed 200 pounds. Females are somewhat smaller, ranging from 24 to 29 inches in height with an average weight of 110 pounds. The breed displays a rectangular body structure, with the length being 10 to 15 percent greater than the height at the withers. This substantial frame features large, well-rounded bones that contribute to an overall impression of tremendous strength and power. The chest is broad and well-developed, descending to the level of the elbows. The most striking feature of this ancient breed is its abundant loose skin and wrinkles, particularly prominent on the head and face. The head is large in proportion to the body, covered with extensive wrinkles and folds that extend from the outer margin of the eyelids down to the voluminous dewlap. Required folds include those extending from the outside margin of the eyelids to the dewlap and from under the lower lids to the outer edges of the lips. The muzzle is broad and approximately one-third the length of the head, giving it a squared appearance with parallel top lines between the skull and muzzle. The deep-set eyes appear almost hidden beneath drooping upper lids, conveying a wistful expression at rest that becomes intimidating when alert. The large nose features well-open nostrils coordinating in color with the coat. The coat is short, dense, and uniform across the body, requiring minimal grooming despite the breed's size. Accepted colors include blue (gray), black, mahogany, and tawny, with lighter and darker shades of these colors occurring within the breed. The tail is set on slightly lower than the topline, thick at the root, and tapers gradually toward the tip. The movement of the Neapolitan Mastiff is characteristically rolling and lumbering rather than elegant, reflecting the breed's massive structure and guardian heritage developed over centuries in southern Italy as protectors of home and family.

Key Characteristics

Temperament
Temperament Temperament Temperament Temperament Temperament Temperament Despite their imposing presence, these dogs are relatively low-energy compared to many other breeds. They are content with moderate exercise and often prefer lounging near their family rather than engaging in vigorous activity. Their movement is characteristically lumbering, and they are prone to drooling significantly, especially after eating or drinking. When properly trained and socialized, the Neapolitan Mastiff becomes a loving, loyal companion who is surprisingly gentle with children and other family members. However, supervision is always recommended due to their substantial size, as they may inadvertently knock over small children during normal movement.
Health Considerations
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Cardiomyopathy and other heart conditions can affect Neapolitan Mastiffs, making regular cardiac screenings important. Progressive retinal atrophy may cause vision deterioration over time, and hypothyroidism can impact metabolism and energy levels. Cancer occurs at elevated rates in this breed, as it does in many large and giant breeds. Prospective owners should seek reputable breeders who conduct thorough health testing and be prepared for the potentially significant veterinary costs associated with caring for a giant breed dog.
Learn More About The Neapolitan Mastiff

Important to Remember

Each hybrid dog is unique and may inherit any combination of traits from either parent breed. The information above represents the characteristics of the purebred parent breeds. Your Neo Bullmastiff may favor one parent over the other or display a blend of both. We strongly encourage you to read the complete breed profiles for both the Bullmastiff and Neapolitan Mastiff to fully understand the range of possible temperaments, health concerns, and care requirements.