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.
Your puppy grows practically at warp speed after birth; by his third week your little guy starts to stand on his own four paws. He's shaky at first, and may stay upright for only a few seconds, but his legs are strengthening every day. By the time he's 4 weeks old, he should start taking his first wobbly steps. His sight and hearing haven't completely developed yet, so he's still fuzzy on the details of his surroundings.