Bernese Mountain Dogs are an affectionate breed, and they show their love through physical contact. They're likely to sit on your feet, place their paws on your chest, give hugs, and rest their head on you whenever the opportunity arises. Physical contact is an important part of bonding for Berners.
The Bernese Mountain Dog is a slow-growing breed that doesn't reach its full size—or mental maturity—for three years. There is a Swiss saying that applies to Bernese Mountain Dogs: "Three years a puppy, three years a good dog, three years an old dog." The breed reaches full size before growing out of puppyhood, so he may be rambunctious even at a few years of age. Polite behavior and gentle play are important skills to teach a growing Berner.
Historically, Berners were used as cart dogs, so they've got impressive pulling power. Bernese Mountain Dogs can pull up to 1,000 pounds. Berners love to compete in the sport of carting or drafting. To prevent injury, Bernese Mountain Dogs must be fully grown—around two years old—before pulling any weight.