Like the other Sennenhunds, the Bernese Mountain Dog is a large, heavy dog with a distinctive tricoloured coat, black with white chest and tan (or rust) colored markings above eyes, sides of mouth, front of legs, and a small amount around the white chest. An ideal of a perfectly-marked individual gives the impression of a white horse shoe shape around the nose and a white “Swiss cross” on the chest, when viewed from the front. Both males and females have a broad head with smallish, v-shaped drooping ears. Height at the withers is 23–27.5 in (58–70 cm) and weight is 65–120 lb (29–54 kg). Females are slightly smaller than males.
The breed standard for the Bernese Mountain Dog states that dogs should not be "aggressive, anxious or distinctly shy," but rather should be "good natured," "self-assured," "placid towards strangers," and "docile."Temperament of individual dogs may vary, and not all examples of the breed have been carefully bred to follow the Standard. All large dogs should be well socialized when young, and given regular training and activities throughout their lives.
Bernese are outdoor dogs at heart, though well-behaved in the house; they need activity and exercise, but do not have a great deal of endurance. They can move with amazing bursts of speed for their size when motivated. If they are sound (no problems with their hips, elbows, or other joints) they enjoy hiking and generally stick close to their people.
The Bernese temperament is a strong point of the breed. They are affectionate, loyal, faithful, stable, intelligent, but sometimes shy. The majority of Bernese are friendly to people, and other dogs. They often get along well with other pets such as cats, horses, etc. They are trainable provided the owner is patient and consistent in training; Bernese need time to think things through. They do not respond well to harsh treatment, however Berners are willing and eager to please their master. Bernese love to be encouraged with praise and treats. The breed is sweet and good with children, despite their great size. Overall, they are stable in temperament, patient, and loving.
Bernese Mountain Dogs are quirky, loving dogs, craving love and affection. They love to lean against people, sit on their feet, or lie down under their legs while people sit.
Bernese Mountain Dogs are slow to mature, and can display puppy-like tendencies up to 2 1/2 years of age.
Health surveys of Bernese Mountain Dogs in Denmark, the UK, and USA/Canada all show that this breed is very short-lived compared to breeds of similar size and purebred dogs in general. Berners have a median longevity of 7 years in USA/Canada and Denmark surveys and 8 years in UK surveys. By comparison, most other breeds of similar size have median longevities of 10 to 11 years. The longest lived of 394 deceased Berners in a 2004 UK survey died at 15.2 years.
Cancer is the leading cause of death for dogs in general, but Berners have a much higher rate of fatal cancer than other breeds. In both USA/Canada and UK surveys, nearly half of Berners died of cancer, compared to about 27% of all dogs. Berners are killed by a multitude of different types of cancer, including malignant histiocytosis, mast cell tumor, lymphosarcoma, fibrosarcoma, and osteosarcoma.
Berners also have an unusually high mortality due to musculoskeletal causes. Arthritis, hip dysplasia, and cruciate ligament rupture were reported as the cause of death in 6% of Berners in the UK study; for comparison, mortality due to musculoskeletal ailments was reported to be less than 2% for purebred dogs in general.
Owners of Berners are nearly three times as likely as owners of other breeds to report musculoskeletal problems in their dogs. The most commonly reported musculoskeletal issues are cruciate ligament rupture, arthritis (especially in shoulders and elbows), hip dysplasia, and osteochondritis. The age at onset for musculoskeletal problems is also unusually low. For example, in the USA/Canada study, 11% of living dogs had arthritis at an average age of 4.3 years. Most other common, non-musculoskeletal morbidity issues strike Berners at rates similar to other breeds.
In short, prospective Berner owners should be prepared to cope with a large dog that may have mobility problems at a young age. Options to help mobility-impaired dogs may include ramps for car or house access. Comfortable bedding may help alleviate joint pain.
