Four-time Olympic show jumper Michael Whitaker has been suspended after his horse failed a drug test.

The 49-year-old Briton has been provisionally banned after his horse, Tackeray, tested positive for the synthetic hormone Altrenogest during a competition last month at La Baule, France.
Whitaker has requested his ""B"" sample be tested. If that is also positive, he wants a full hearing before an International Equestrian Federation tribunal.
Whitaker, a silver medalist at the 1984 Olympics, was a late withdrawal from last year's Beijing Games due to an injury to his horse, Portofino.
(Source: AP)