In temperament the breed is calm, confident and watchful, attached to its household and inclined to bark at strangers without being aggressive. It matures slowly. Owners commonly call it the Swissy.
It is a large, heavily boned and muscular dog, slightly longer than tall, with a broad, flat skull and a strong muzzle. The short, dense double coat is tricoloured: a glossy black ground with rich rust markings over the eyes, on the cheeks, chest and legs, and white on the blaze, muzzle, chest, feet and tail tip. The thick undercoat is preferably dark grey or black but may be lighter.
The Greater Swiss Mountain Dog, called the Grosser Schweizer Sennenhund in its homeland, was long kept by farmers, dairymen and butchers in Switzerland. It pulled carts of milk, cheese and meat to market, moved cattle and guarded farmyards. It had grown rare by the late nineteenth century until Albert Heim championed it in the early twentieth. It stayed scarce for decades, though the Swiss army used it as a draught dog around the time of the Second World War. Dogs reached the United States in the late nineteen-sixties, and the American Kennel Club recognised the breed in the nineteen-nineties.