The Most Expensive Horse

The most expensive horse was a Thoroughbred that sold for $40,000,000! His name was Shareef Dancer. His exquisite line included Northern Dancer and Sweet Alliance.
Shareef Dancer was entered into races five times - he got three firsts and placed second once. He was was even declared as the UK Middle Distance Horse of 1983 after racing in both the Irish Derby Stakes and the King Edward VII Stakes...winning both times!