But soon Flush became aware of the more profound differences that distinguish Pisa — it was in Pisa that they were now settled — from London. The dogs were different. In London he could scarcely trot round to the pillar-box without meeting some pug dog, retriever, bulldog, mastiff, collie, Newfoundland, St. Bernard, fox terrier or one of the seven famous families of the Spaniel tribe. To each he gave a different name, and to each a different rank. But here in Pisa, though dogs abounded, there were no ranks; all — could it be possible? — were mongrels. As far as he could see, they were dogs merely — grey dogs, yellow dogs, brindled dogs, spotted dogs; but it was impossible to detect a single spaniel, collie, retriever or mastiff among them.