The other period that you need to know about happens anywhere between six and 14 months old. In this period, the young dog can start to behave fearfully to things and people that he has previously been interacting with happily. This period coincides with the onset of sexual maturity and the surge of hormones that brings.

As soon as you notice these fear responses starting, revisit your Puppy Plan chart, and give him a refresher socialisation course – aiming to give him plenty of positive experiences with everything that is on the chart using treats, play and fun to overcome his fears.