All of a sudden, there's a pack of dogs roaming the streets. While it used to be that you had to fly to the Windy City for the real deal, now it seems you can't swing a dead cat without hitting a Chicago dog. Off the top of my head, there's Hot Diggity Dog on Ewing Street, The Dog on Nolensville Road and I Dream of Weenie in a mobile cart on Woodland Street. Zackie's is hanging its awning in Germantown in the ground floor of the Summer Street Lofts and promises to open soon. With so many variations on a commodity, how do you pick a wiener?