When money's in short supply, people need to get creative. So if you want a present for your pet and can't afford that gold-plated flying doggy disc that's all the rage, take your pooch for a stroll down Cherry Creek Drive, along the eastern edge of Pulaski Park. This particular spot is just south of Gates Tennis Center, whose twenty public tennis courts apparently draw a lot of bad but powerful tennis players. Every day, ham-handed lobbers send balls flying over the fence, onto the busy street, then into the gutter beside the sidewalk. Your pooch will think he's wandered into pet heaven -- but keep a tight hold on his leash, or traffic may send him to the real thing.