distractions

If you're a student of dog training, you're probably well aware of the oft suggested protocol of teaching new behaviors in a low distraction environment and slowly adding in distractions until the behavior becomes reliable. This is, of course, the easiest way for a dog to learn what you'd like them to do and to be able to do that thing regardless of distractions. However, in the real world, distractions happen.

To avoid them completely until the dog is "trained" is simply unrealistic.