There is a lot of changing in the 3rd week. The senses of the pups begin to awaken and unfold.
Third week
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An active investigation of the immediate surroundings starts...
...and the first contact with the siblings.
As E. Trumler says: "The germ is sown at this stage for the divers social behavioural patterns of the adult dog."
Whatever - life is beautiful... 
...live is tiring and ... 
... and sometimes it is boring when all the others are asleep! 
Every day's procedure: In the first few weeks, the weighing scales are a great asset.
Worming - absolutely necessary but it is disgusting!
And not to forget: clipping the nails! 
From the seventeenth day on, the pups wil be observed licking one another and inspecting their other siblings.
The battery is down... 
...and mom helps to reload the battery!