Hogg and her brothers were avid art collectors; she owned a large collection, including Native American art and works by Picasso, Chagall, Matisse and Modigliani. Her interest in collecting began during her convalescence in Philadelphia. Her first purchase, in 1922, was a Spanish foot chair or Queen Anne maple chair with carved feet. She researched the early American furniture market extensively, personally visiting Luke Vincent Lockwood, the author of the standard work on the topic, for more information. At the time, Hogg was one of a small number of people who believed that American antiques had value—by contrast, most collectors concentrated on furniture built in Europe. Other collectors soon saw the value in early American pieces. Hogg remained one of the few collectors not located on the East Coast. As her collection grew, she was often asked to loan pieces for exhibit in New England; Hogg always refused, stating "they've got plenty of these things up there".