LONDON.- Dulwich Picture Gallery will celebrate its 200th anniversary in 2011 with its first ever acquisition of a piece of contemporary sculpture, purchased and presented to the gallery by the Art Fund in honour of Dulwichs bicentenary. The work, called Walking the Dog I, II,III, is by leading British sculptor Peter Randall-Page, who is currently enjoying rave reviews for his exhibition at the Yorkshire Sculpture Park. Inspired by the Gallerys famous building and its three founders, it is the first sculpture to be included in the permanent collection. Randall-Page (b. 1954) was first introduced to the Gallery, through mutual friends. Ian Dejardin, the Gallerys Director, was quick to follow up, having been an enthusiastic admirer of the sculptors work for several year. I had a private list of sculptors whose work I dreamed of one da