Shire horses are the world’s largest horses. These giant horses can measure more than 2 metres in height! Shire horses are gentle giants. With a maximum weight of more than 1,200 kilograms and 1.78 metres at the withers, the calm Shire horse is the largest breed in the world. The biggest Shire horse ever measured was a gelding standing 2.19 metres high. These horses are considered gentle giants because despite their height, they have a very calm temper.