1. Bernese Mountain Dog: Known for their strength and loyalty, they were originally bred to herd cattle and pull carts. Today, they excel in various tasks like therapy work, search and rescue, and disability assistance.
2. Great Dane: Despite their imposing size, Great Danes are known for their gentle nature and intelligence. Historically, they were used for hunting boar and protecting property, but they are now commonly employed as therapy dogs, service dogs, and even in law enforcement.
3. Newfoundland: These massive dogs were originally bred to haul fishing nets and rescue people from the water. They are renowned for their strength, gentleness, and water-loving nature. Newfoundlands are still used for rescue work, as well as therapy and service roles.