Out of the mare Polar Queen, a granddaughter of Danzig, Collier Hill was sired by the 1992 Epsom Derby winner, Dr Devious.
While the horse was racing in Dubai, a veterinarian diagnosed him as suffering from arthritis that required medication being given through injections in his joints on a near bi-monthly basis.
A disagreement between co-owner Ashley Young and trainer Alan Swinbank led to Collier Hill being put up for sale at a Tattersalls auction in October.
Co-owner Russell Hall was the successful bidder who then immediately sold Young's former half-share to David Abell and Richard Crowe.
He finished second in a repeat appearance in the Dubai Sheema Classic, returned to Sweden to win another Stockholm Cup International, and became the first 8-year-old to win the C$2 million Grade 1 Canadian International Stakes at Woodbine Racetrack in Canada and the HK$14 million Hong Kong Vase in Hong Kong, China.