Owning a dog is a tremendous responsibility, and a privilege when done correctly. A well-trained and obedient dog will reward you with love and affection, and you -- as the dog owner -- can live with the satisfaction that the training and regimen you used successfully raised "a good boy."
However, not every dog owner is like this. Many people go into dog ownership with a misconceived idea for how it will go. Others simply aren't responsible or patient enough to properly train a dog. This leads to some dogs that have unfortunate habits, and even some downright dangerous ones. Such behavior can lead to people needlessly suffering from a dog bite or dog attack, and all because the owner of the dog failed to properly train their pet.