You have probably seen some really big dogs where you live, but what are the top 10 Largest Dog Breeds in the world? And what is the biggest dog in the world? Let’s find out! 10. Leonberger Height: 25.5-31.5″ (65-80 cm) Weight: 90-170 lb (41-77 kg) The Leonberger is a family-friendly and mild-tempered dog with its origins in Germany. It’s a versatile worker that’s also used for search and rescue. 9. Newfoundland Height: 26-28″ on average (66-71 cm) Weight: 100-176 lb (45-80 kg) Thanks to its sweet and gentle temperament, the strong and loyal Newfoundland is a great family dog.