Among Arnup's most notable commissions was a work for the Duke of Edinburgh’s 80th Birthday, depicting his Fell Pony Storm. In 1971 she cast a silver leopard which was presented to HM Queen Elizabeth II by the City of York. A life-sized sculpture of an Irish Wolfhound by Arnup was posthumously donated to the York Art Gallery in 2017. She regularly exhibited at the Royal Academy in London, with the Royal Society of British Artists, with the Royal Scottish Academy and at the Paris Salon. In 1968 the University of York hosted a solo exhibition of her work as did Gainsborough House in Suffolk during 1998. The Arnup Studio where both Sally and Mick Arnup worked, was opened to the public in 2011 as part of York Open Studios.
