Originally bred to work, the Bernese Mountain Dog is strong and muscular. Some of the biggest dog breeds in the world are also some of the best dogs. Despite their intimidating size, they're easygoing, have big hearts and are gentle giants.
Many are also extremely protective of their families, and when fully grown can weigh as much as 170 pounds (77 kilograms)! So that begs the question: What is the biggest dog in the world? And is there a difference between large dog breeds and giant dog breeds?