Aerobes are bacteria that require oxygen for survival. They cannot undergo metabolic processes without oxygen. Facultative anaerobes are well adapted and able to survive in a variety of environments whereas the obligate anaerobes and aerobic bacteria are limited in the types of environments that they can survive in.
Classical conditioning, because the dog gave an involuntary response to a stimulus. If it were operant, the dog would have performed an action to receive the walk.
