But others are automatic â though not guaranteed â such as the jump from private first class to specialist. Once a private becomes a specialist, he begins prepping for leadership. This is a crucial time in his molding process because he will soon enter the ranks of the non-commissioned officer corp.
1 Puppies will stand up and start walking. 2  At the age of 3 weeks a puppy will develop its sense of smell. 3  At 3 weeks the puppy will begin to bark and show social development such as wagging its tail, growling and baring its teeth.  Up to the age of 4 weeks the mother will be with the puppy almost constantly.
Allow your puppy time to socialize, as 5-month-olds are testing out their social boundaries. Let your puppy play with littermates, plan puppy socials or take a solo pup to the dog park for supervised play. During this phase, pups may nip and nibble. Correct this with a firm No and a tug on the leash.