"The most impressive beggars, however, get their own title: 'metro dogs'. They rely on scraps of food from the daily commuters who travel the public transportation system. To do so, the dogs have learned to navigate the subway. They know stops by name, and integrate a number of specific stations into their territories."

Score another one for science fiction. SF writers have talked about city-specialized animals emerging for a while now, and while you could certainly say that some critters have adapted nicely (pigeons, squirrels, depending on the degree of urbanization), dogs that know how to use crossing signals is, IMHO, a higher level.

See also their symbiotic protection of the inner city from the vicious dogs. Note that had the politicians decided to be rid of them, that would have been the end of them, so they actually passed a selection criterion there. Humans have, at least for now, accepted this breed as symbionts at the urban level. One could easily imagine them further specializing rather quickly, if they are not wiped out.