Also called the Fear of New Situations Period, this period is less defined and may occur more than once as the puppy goes through growth spurts. During this period, the puppy will also be teething. ALthough all of the adult teeth are through the gums by 6-6.5 months of age, they don't "set" in th jawbones until 8-10 months; so even well-trained puppies will need to chew and some will become very destructive at this age if not properly supervised. A very well socialized puppy, who has been meeting and greeting the world in an outgoing happy manner, may almost overnight start to fear people and things that it wouldn't have even noticed before. This period usually corresponds to growth spurts and, unfortunately corresponds with a puppy's first dog shows. It's still time to socialize, socialize and socialize some more - allowing the puppy to work things out while building self confidence. Be sure to never console a puppy who is afraid or mildly injured. Make light of the fear; intorduce lots of play behavior and praise; reinforce basic obedience and attention training; and increase exercise. Dehasse characterizes this period as "the dog's anticipating harmful situation that exist only its mind with subsequent behavioral strategies that include defense mechanisms of flight, aggression and low inhibition." Adolescence also coincides wit this fear period with accomponying hormone surges, increased excitability, intensity about everything and the challenging of authority once again. Pheromones emitted by a dog can trigger dominance from other dogs, which can be very traumatic to a dog at this time. Males start to lift their leg to urinate at 5-13 months, depending on several factors including their ability to imitate another male. They develope great interest in females and can develop objectional behaviors such as marking territory, mounting or humping, desire to roam or fighting with other dogs.