Mountain Dog, called in German Berner Sennenhund, is a large breed dog, one of the four breeds of Sennenhund type of the Swiss Alps. The name Sennenhund is derived from the German Senne (“alp”) and Hund (“dog”), as they accompanied the alpine herders and milk producers called Senn. Berner (or Bernese in English) refers to the area of origin of the race, in the canton of Bern. This Mountain dog was originally kept as a general farm dog. Sennenhunde great in the past were also used as draft animals, pulling carts. The race was officially established in 1907.  In 1937, the American Kennel Club recognized;.  Currently, the club classifies it as a member of the Working Group 
Four breeds of Sennenhund
The four breeds of Sennenhund, with the name of the original race, followed by the most popular English version of the name of the breed:
Grosser Schweizer Sennenhund, Greater Swiss Mountain Dog
Berner Sennenhund, Bernese mountain dog
Appenzeller Sennenhund, Appenzeller
Entlebucher Sennenhund, entlebucher mountain dog
At 60 pounds, eight month old puppy mountain dog
Like other Sennenhunde, the Bernese mountain dog is a big, heavy dog with a coat tri-colored distinctive, black with white chest and rust marks color on the eyes, the sides of the mouth, in front of the legs, and a small amount around the white chest. An ideal of a perfectly marked individual gives the impression of a white horseshoe around the nose and a “Swiss cross” on the chest, white when viewed from the front. A “Swiss kiss” is a white label typically located behind the neck, but can be a part of the neck. A complete ring would not meet the standard model. The AKC breed standard lists, such as disqualifications, color blue eyes, and any background color other than black.  
weight and height ranges
The height at the withers is 25 to 27.5 in (64-70 cm) for men, while is 23-26 (58-66 cm) for females. Weight is 80-120 lbs (35-55 kg) for men, while it is 75 to 100 lb (35-45 kg) for women. 
Build and proportions
The Bernese Mountain Dog is slightly longer than tall, and very muscular.
Other physical features
Head Bernese Mountain Dog is flat on top with a moderate stop, and ears are medium sized, triangular, high and rounded at the top. The teeth have a bite scissors. The Berner legs are straight and strong with rounded toes, arched. Rams the Berne often removed. Its bushy tail is carried low.
The standard dog breed Bernese Mountain states that dogs should not be “aggressive, anxious or distinctly shy” but must be “good character”, “confident”, “placid towards strangers” and “docile”.  temperament of the individual dogs can vary, and not all examples of the breed have been raised with care to follow the standard. All large breed dogs must be well socialized as puppies, and given training and regular activities throughout their lives.
Bern, are outdoor dogs at heart, though good behavior at home; you need activity and exercise, but do not have a lot of resistance. They can move with amazing bursts of speed of their size when motivated. If they are sound (no problems with their hips, elbows, or other joints), enjoy hiking and generally stick close to his people.  have the right amount of exercise can lead to barking and harassment in the Oberland. 
Bernese mountain dogs are a breed generally does well with children because they are very affectionate.  dogs are well patients taking children climbing over them.  Although they have great energy, Bern also be happy with a quiet evening. 
Bern work well with other pets and strangers.