Green Monkey – Thoroughbred Racehorse – $16 Million
Topping the list of the most expensive pets in the world is Green Monkey, an American thoroughbred racehorse.
Why is he so darn expensive? Well, it has something to do with his incredible speed, running a mile in just under 9.8 seconds in his first ever race.
He was also fathered by another thoroughbred American racehorse, Forestry.
So, a combination of his impressive speed and perfect genetics made him one of the most highly sort after horses in the equestrian world.
He was auctioned for $16 million in 2009!