Eugene Wyatt is a shepherd in the Hudson Valley who manages his flock of merino sheep with the help of Poem, an Australian Kelpie sheepdog. Together the shepherd, sheep and sheepdog are Catskill Merino Sheep Farm (www.catskill-merino.com ). On Saturday the farm has a stand at the Greenmarket in Union Square where they sell their lamb, vegetables, and hand-dyed merino yarn.