Let your dogs meet safe, calm non reactive dogs during this period, so that your dog learns social behaviour from the best that you can find.
The Second Fear impact period (6 - 14 Months): Also called, "The fear of situations period", usually corresponds to growths spurts. This critical age may depend on the size of the dog. The fear period at this stage lasts about one month and can vary depending on the size of the dog. During this time a reactive dog or any other scary event can affect the puppy for the rest of his life. Take great care not to frighten your dog during this period. Soothing tones may serve to validate his fear. His fear should be handled with patience and kindness, and training during this period should put the dog in a position of success, while allowing him to work things out while building self-confidence. Praise during training experiences goes a long way to overcoming fear.