Martin Cruz Smith said this quote
“ Wolves eat dogs. That did seem to be the consensus of the village, Arkady thought. Roman shook his head as if he'd given the matter a lot of consideration. Wolves hate dogs. Wolves hunt down dogs because they regard them as traitors. If you think about it, dogs are dogs only because of humans; otherwise they'd all be wolves, right? And where will we be when all the dogs are gone? It will be the end of civilization. ”