The majority of dogs, partly due due to their dispositions and partly due to their training, will never be 100% "under control" via voice commands, or even tugging on a leash. However some dogs are extremely obedient, even under the most trying of conditions. These are mostly working dogs, with a lot of training, but occasionally a relatively untrained dog can exhibit these traits.
The problem is that everyone seems to think their own dog is one of these exceptional animals, but very few of them actually are. Dogs will be dogs, I worry more about the owners.