The Bernese Mountain Dog Calendars feature these striking, tri-colored, large dogs who thrives in cold weather. These Cattle Dogs are one of four distinct Swiss breeds descended from a cross between Roman mastiffs and the local dogs. The Bernese Mountain Dog is a large, squarely built animal with dark brown eyes and triangular drop ears that are set high on the head. All of this, along with their deep chest and bushy tail are covered in a long, glossy, distinguishingly tricolor coat. Because of their heavy coat they do not do well in very hot or humid climates. The Bernese Mountain Dog is gentle in temperament and easy to get along with. Sweet in nature, the Bernese Mountain Dogs are outgoing, affectionate canines who love children and are very loyal to their family, and usually to other pets as well. Large as they are, they require sufficient space to run and play. Although Bernese Mountain Dogs may be sloppy in their affections and remain a happy dog most of the time, they do retain some guarding instinct and may not always warm up to strangers at first. They are one-owner dogs and may find it difficult to adjust to a new owner if introduced after 18 months of age. With their sleek look and sweet temperament, Bernese Mountain Dogs are ideal for an active owner in a suburban or rural environment. Bernese Mountain Dog Calendars.