The Bernese Mountain Dog is gentle, cheerful and loves children. They are very intelligent, easy to train and are natural watchdogs, but not overly aggressive. A friend for life. They are very loyal and may have trouble adjusting to a new owner after they are more than 3years old. Self-confident, alert and good-natured. They are fairly friendly with strangers, and are generally good with other pets and dogs. Never sharp or shy. The Bernese needs to be with people and not relegated to the backyard or kennel run. Like any dog, the Bernese Mountain Dog should be well socialized as a puppy.