Bull Daniff

The Bull Daniff is a cross between the Bullmastiff and the Great Dane. Because each hybrid inherits a unique combination of traits from both parents, we recommend thoroughly researching both breeds before choosing a Bull Daniff. 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, powerful dog that presents an impressive picture of symmetry, strength, and substance. Males typically stand twenty-five to twenty-seven inches at the shoulder and weigh between one hundred ten and one hundred thirty pounds, while females stand twenty-four to twenty-six inches and weigh between one hundred and one hundred twenty pounds, with the more substantial dog within these limits preferred. The breed's foundation breeding of approximately sixty percent Mastiff and forty percent Bulldog is evident in its solid, muscular build that combines power with athletic capability. The body is nearly square in proportion, with the length from breastbone to rear of thigh only slightly exceeding the height at the withers, creating a compact, balanced appearance. The Bullmastiff's head is large and impressive, with a fair amount of wrinkle showing when the dog is alert. The broad, square skull features well-developed cheeks and a pronounced stop, while the muzzle is short, broad, and deep, approximately one-third the length of the entire head. This proportion is essential to breed type, and dogs lacking proper foreface revert too much toward the Bulldog and are undesirable. The dark, medium-sized eyes convey an expression that is keen, alert, and intelligent. V-shaped ears are set wide and high on the skull, carried close to the cheeks and level with the occiput, giving the head a square appearance. The ears are darker in color than the body and are medium in size. A dark muzzle is preferred, and the nose is black with large, broad nostrils. The Bullmastiff's short, dense coat provides excellent weather protection while requiring minimal grooming. The breed comes in three acceptable colors: red, ranging from light to dark; fawn, from very light tan to reddish-brown; and brindle, featuring stripes of red or fawn overlaid on a darker background. A small white spot on the chest is permitted, but white markings elsewhere are considered faults. The tail is set high, strong at the root, and tapers to the hock, carried straight or curved but never curled over the back.

Key Characteristics

Temperament
Temperament Temperament Temperament Temperament Temperament Temperament Training a Bullmastiff requires patience, consistency, and a confident handler who can establish leadership without harsh methods. These intelligent dogs can be stubborn and will test boundaries, making early training essential before they reach their full size and strength. Bullmastiffs require moderate exercise and are generally calm indoors, making them surprisingly adaptable to various living situations despite their size. They do not tolerate extreme heat well and should have access to air conditioning during warm weather. While they can coexist with other animals when properly introduced, some individuals may display dominance toward other dogs, particularly those of the same sex.
Health Considerations
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Gastric dilatation-volvulus, commonly called bloat, is a life-threatening emergency that Bullmastiffs are particularly susceptible to due to their deep chest. This condition occurs when the stomach fills with gas and twists, cutting off blood supply and requiring immediate surgical intervention to save the dog's life. Prophylactic gastropexy during spay or neuter surgery can significantly reduce this risk. Cardiac conditions including dilated cardiomyopathy and sub-aortic stenosis affect the breed, making regular cardiac screening advisable. Entropion is the most common eye problem, requiring surgical correction to prevent corneal damage. Progressive retinal atrophy can lead to blindness. Hypothyroidism causes metabolic dysfunction and is manageable with medication. The breed may also develop kidney problems and is prone to cruciate ligament injuries in the knees.
Learn More About The Bullmastiff

Great Dane

Great Dane

The Great Dane is one of the tallest dog breeds in the world, combining massive size with elegance and power in a way that has earned it the nickname Apollo of Dogs. Male Great Danes must be at least thirty inches at the shoulder, with thirty-two inches or more preferred, and typically weigh between one hundred twenty and one hundred seventy pounds. Females must be at least twenty-eight inches, with thirty inches or more preferred. The breed's body should be square in proportion, with the height from withers to ground equaling the length from breastbone to rear of buttocks, creating a balanced, athletic silhouette despite the enormous size. The Great Dane's head is long, rectangular, and distinguished, with a strongly pronounced stop where the forehead meets the bridge of the nose. The muzzle is deep and broad, and the planes of the skull and muzzle should be parallel to each other. Medium-sized eyes are deep set and dark, conveying an intelligent, lively expression, though blue eyes are permitted in harlequin and merle color varieties. Ears are naturally medium-sized and set high, folding forward close to the cheeks, though cropped ears that stand erect are still seen in some countries where the practice remains legal. The Great Dane's short, thick, smooth coat has a glossy appearance and requires minimal grooming. The breed comes in seven recognized color patterns: fawn with black mask, brindle with black chevron stripes, glossy black, steel blue, harlequin with black torn patches on pure white, mantle with black body and white markings, and merle with grey patches on lighter background. The long tail is set at the same level as the back and tapers uniformly, reaching to the hock, and should never be docked. The breed moves with powerful, smooth strides that cover considerable ground while maintaining an impression of effortless elegance.

Key Characteristics

Temperament
Temperament Temperament Temperament Temperament Temperament Temperament Great Danes are intelligent dogs that respond well to training when approached with consistency and positive reinforcement methods. They are sensitive to their owners' moods and do not respond well to harsh corrections. Early socialization and obedience training are essential given the breed's ultimate size, as it is much easier to teach proper manners to a puppy than to correct behavior in a fully grown dog that can weigh more than most adults. These dogs have moderate exercise needs and are generally calm indoors, making them surprisingly well-suited to apartment living as long as they receive daily walks and opportunities to stretch their long legs.
Health Considerations
Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Health Considerations Dilated cardiomyopathy is extremely prevalent in Great Danes, affecting the breed at much higher rates than the general dog population. This progressive disease causes the heart muscle to weaken and enlarge, eventually leading to congestive heart failure. Regular cardiac screening through echocardiograms is recommended to detect this condition early. Hip dysplasia affects many Great Danes, causing painful arthritis and mobility problems. Wobbler syndrome is a neurological condition involving compression of the spinal cord in the neck, causing an unsteady, wobbly gait. Hypothyroidism is relatively common and requires lifelong medication. Osteosarcoma, an aggressive bone cancer, occurs at elevated rates in this breed and often presents in middle age. Happy tail syndrome, where repeated impacts cause non-healing wounds on the tail tip, may require surgical shortening in severe cases.
Learn More About The Great Dane

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 Bull Daniff 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 Great Dane to fully understand the range of possible temperaments, health concerns, and care requirements.