At eight months old, baby Olive is already a Christmas pro. Relaxed and calm in a red collar festooned with jingle bells, the 140-pound reindeer gazes into camera after camera at a holiday meet-and-greet in DeKalb.... They’re like big puppies, ” he said. This time of year can get hectic, with as many as 10 appearances a week at tree lightings, malls, customer appreciation events, country clubs and private residences.... “ It just makes it so fulfilling.” Randy Espe kisses his reindeer Olive at