Incidentally, the period between 8 and 12 weeks is the most critical period for socialising - the period when the in the wild, the mother teaches the pups what is safe and edible, what must be feared and avoided and what is neutral and can be ignored. This role falls on the master who has taken the pup away from its mother. If proper socialisation is not done at this stage then the pup may become fearful of anything it has not been exposed to during this period - for life. So it is extremely important to take the pup out and show it other animals, birds, people (children, women) traffic, trains, etc. Yes, there is a risk of infection if allowed to sniff around till the vaccinations take effect but you can always take it out in a basket or in your arms but surely don't make the mistake of confining it indoors out of fear of exposure.