Who Is the Biggest Dog in the World? As of 2025, the title of biggest dog in the world belongs to Zeus, a Great Dane from Texas, USA. Zeus measured 44 inches tall (at the shoulder) and weighed over 155 pounds. Sadly, Zeus passed away in 2023, but he still holds the record in the Guinness World Records for tallest dog ever. Biggest Dogs in the World (All-Time Tallest) Dog Name Breed Height at Shoulder Zeus (2022) Great Dane 44 inches Freddy Great Dane 40.75 inches Gibson Great Dane 42.2 inches Titan Great Dane 42 inches Boomer Landseer Mix 36…