Nobody's Business

Although I understand why Sang wanted to leave for London come the end of her relationship with Farouck, I still do not believe that she did so in the most appropriate manner. She left someone [Paul] who so obviously cared for her without even a proper goodbye. I am also extremely curious as to what Farouck would actually say to Sang on the phone if she was home when he called - no words could ever make up for what he did to her so I'm not quite sure why he repeatedly called the house. Another thing that I am slightly confused about is the significance of the dog at the end of the short story. Is that dog the reason that Freddy "never liked dogs"? So that the dogs would never notice the other dogs scent? Or is that dog a symbol that the entire situation with Sang changed Freddy and now he is pursuing an actual relationship?