ROBERT HARDMAN takes a giddy ride on Britain's largest horse . horses which previously held the record for the world's tallest living horse. Zeus is the largest horse in the world! 21 Hands Tall (7 feet) at the shoulder Approximately lbs Breed - Belgian Draft Horse Blog says "no saddle fits him ". At cm ("), year-old Belgian gelding Big Jake stands as the world's tallest horse. Jerry.