Alice Hoffman said this quote

They say that dogs may dream, and when Topsy was old, his feet would move in his sleep. With his eyes closed he would often make a noise that sounded quite human, as if greeting someone in his dreams. At first it seemed that he believed Sara would return, but as the years went by I understood that his loyalty asked for no reward, and that love comes in unexpected forms. His wish was small, as hers had been -- merely to be beside her. As for me, I already knew I would never get what I wanted.