Dogs have long been used in battle for attack, protection and sentry duty.

WSJ: Letting Slip the Real Dogs of War

Howard Johnson won the World Hurdle three times with Inglis Drever and he has entered Tidal Bay this time while Cousin Vinny, Karabak, Katchit and Sentry Duty are other interesting contenders.

BBC: Big Buck's heads Cheltenham World Hurdle entries