For every customer that came into Zhang Zian's pet store wanting to buy a dog, he would tirelessly emphasize that dogs had to be trained. Untrained dogs did harm to themselves and to other people; they were worse than salted fish. If one bought a dog without training it, they might as well have bought a cat. That was especially the case for large-sized dogs. If they were not properly trained, then sooner or later they would cause trouble and become a villainous dog that people despised.
Dogs were generally divided into pet dogs and working dogs. What people looked for in pet dogs was overall condition and appearance, but what was the criteria for working dogs?
For working dogs, its happiness, concentration, ability to do things, and personality were most important. Those were much more important than its conditions and appearance.
