my dog is coming up to 18 months is it too late?? normally very good when younger but gone a bit too cocky now, will tend to ignore and wander off also if anything gets his attention (other dog) he is off, very annoying. Will this technique help or is it too late? Also as i work in the day my father will take him out for a walk in the day and i will take him in the evening, my dad will let him off the lead in the field and so will I, will this affect the Reliable Recall training if we are letting him run around the field or is it still ok? Or do we have to basically knuckle down on him for a fe weeks?