This period can occur sometimes between 4 and 8 months of age and can last for a few days or several weeks. The puppy will "test its wings," wander furthuer away than ever before and its first response may be to flee. A puppy that previously came every time you called will now "turn a deaf ear" and be very difficult to catch. It's important to avoid off-leash time and to praise correct reponses. Some people refer to this time as the "ha ha ha, you can't catch me" time. Use of a long line outside and short leash inside (so that the puppy can never make the decision not to come) during this time will prevent accidents and actually shorten the length of time the puppy behaves in this manner.