By DENNY DYROFF, Staff Writer, The Times   The “Dog Days” of summer are long gone for this year. The “Dog Days’ of autumn are coming up this weekend. On November 14 and 15, the National Dog Show will be held at the Greater Philadelphia Expo Center (100 Station Ave., Oaks, 484-754-3976, http://nds.nationaldogshow.com). The show’s sponsor – the Kennel Club of Philadelphia – will host...