Born in 1872, the future Duchess was the daughter of Major Henry Augustus Candy married Henry Pelham-Clinton, 7th Duke of Newcastle, in 1889, with whom she shared several common interests. Both were interested in animals, with horses and dogs being their favourites. Prior to the marriage, Kathleen was already a judge and dog show exhibitor, primarily of Fox Terriers. The Duke knew of the Duchess's knowledge of dogs, and when a dealer attempted to sell him a spaniel he once said "It would not suit me to do that. Her Grace knows the market value just a bit too well to suit my fancy." The couple had no children.