Time Out says
Pet-friendly park located inside the Sha Tin Racecourse
Located inside the Sha Tin Racecourse and managed by the Hong Kong Jockey Club (essentially the park within the circle of the tracks), this beautiful green park is open to the public on non-race days. Penfold Park covers more than 20 acres and features luscious green lawns and man-made lakes that have become home to many of our city’s wild migratory waterbirds such as egrets. Your pets can freely roam around, paddle around the lakes and race other dogs in the area – you know, like the horses.