TOPSHOT - Britain's Prince William, Duke of Cambridge, (3rd L) presents a sprig of shamrock to a 4 year-old Irish Wolfhound called Domhnall, who is the mascot of the 1st Battalion Irish Guards, during a St Patrick's Day Parade in Hounslow, west London on March 17, 2016.  / AFP / POOL / Heathcliff O'Malley        (Photo credit should read HEATHCLIFF O'MALLEY/AFP/Getty Images)