The Greater Swiss Mountain Dog ( or ) is a dog breed which was developed in the Swiss Alps. The name Sennenhund refers to people called Senn or Senner, dairymen and herders in the Swiss Alps. Greater Swiss Mountain Dogs are almost certainly the result of indigenous dogs mating with large mastiff-type dogs brought to Switzerland by foreign settlers. At one time, the breed was believed to have been among the most popular in Switzerland. It was assumed to have almost died out by the late 19th century, since its work was being done by other breeds or machines, but was rediscovered in the early 1900s. The breed is large and heavy-boned with great physical strength, but is still agile enough to perform the all-purpose farm duties it was originally used for. Its breed standard calls for a black, white, and rust colored coat. The Greater Swiss Mountain Dog is sociable, active, calm, and dignified, and loves being part of the family. It is relatively healthy for its size and tends to have far fewer problems than more popular breeds in its size range. Among the four Sennenhunde, or Swiss mountain dogs, this breed is considered the oldest, and is also the largest. History Breed history The origin of the Greater Swiss Mountain Dog is not known. Beginning in 1515, the remote valleys of Switzerland were more or less isolated from world history for three centuries. Specific dog breeds were created by inbreeding, and puppies were given to neighbors and family members. There are several theories regarding the origin of the four Sennenhund breeds. The most popular theory states the dogs are descended from the Molossus, a large mastiff-type dog, which accompanied the Roman Legions on their invasion of the Alps more than 2,000 years ago. A second theory is that in 1100 BC, the Phoenicians brought a large dog breed with them to settlements in Spain. These dogs later migrated eastward and influenced the development of the Spanish Mastiff, Great Pyrenees, Dogue de Bordeaux, and Sennenhund breeds. A third possibility is that a large dog breed was indigenous to central Europe during the Neolithic Period, when humans grew wild and domestic crops and used domesticated animals. Whether or not a domesticated large breed existed in the Alpine area when the Romans invaded, Greater Swiss Mountain Dogs are almost certainly the result of the mating of native farm dogs with