What is the biggest dog breed on the entire planet? Have you ever stopped to wonder what are the biggest dogs in the world? Before you can make a list, you must define what you mean by biggest.

In this age of modern domestication, why are the largest dog breeds ... after the Guinness Book of World Records crowned him the world’s tallest living dog. He was 3 years old.

The biggest dog in the world by height was Zeus, a Great Dane from Otsego, Michigan. According to the Guinness World Records, Zeus was 44 inches tall and 7 feet, 4 inches on his hind legs.