Guinness World Records 2000'' – Millennium edition, Pg 106, Guinness World Records Ltd., 2000, According to the 1989 edition of the Guinness Book of Records, in March 1989, when he was 7 years old, Zorba stood 37 inches at the shoulder and was 8 ft 3 in (251 cm) from the tip of his nose to the tip of his tail, about the size of a small donkey.