2 – St. Bernard
St. Bernard is the best biggest dog breed in the world. He measures a height of 25.5 to 27.5 inches and weight 130 to 180-pounds
However, they have a short lifespan of only 7 – 10 years. They can easily learn new things and can be a great companion and protector to the family. They are headstrong and often adhere to thier mind tells them, but they are sweet and shy sometimes.