Finding the leader of the pack

Dogs are animal living in a pack. In a pack of dog, there will be one of them who is the leader. When my doberman puppies were 7 weeks old, I tried to identify who was the leader of the pack.  

The first two photographs below was taken when the doberman puppies were let to go into the garden for the very first time. All the puppies has never stepped onto grasses before. The first two photographs showed that all the puppies hesitated at the edge of the garden for a moment. 

The third photograph showed the leader of the pack going into the garden. The last photographs showed the next in command of the pack.  

(1) All puppies hesitated at the edge of the garden

(2) A second later, all still feeling out for themselves

(3) One of them with the yellow ribbon explored out

(4) Followed by the puppy with green ribbon 

After the puppy with the yellow ribbon followed by the puppy with the green ribbon, the rest of the puppies followed to go into the garden for the first time. 

The second time onward whenever it was play time in the garden, all the puppies are so impatient waiting at the fence. Once the fence was opened, all of them would rush in and have a good time.

When the puppies grew older, the leader was confirmed when they played together. The leader would be running in front of the pack and the rest would be following the leader. Or, the leader of be the one running away with the ball and the rest chasing after it.