Originally Posted by Aussieguru
Even though 7 weeks is young, the only reason a puppy would stay with it's mother until 8 weeks+ is bite inhibition/manners that a mother would teach.
Not quite, AG. The puppies learn a lot from their littermates
as well. And if larger breeds are separated early from their mothers, responsible
breeders aren't very well sending them home at that point--they should be kept with their littermates to continue learning bite inhibition, social skills, and about their environment amongst the safety of each other. As far as shelters letting them go that early--well, I wouldn't be very supportive of such practices, unless each pup had no littermates or mother available. It works against pet retention goals to separate them from their littermates/mother early since they'll miss out on key socialization/learning and increases the chance of behavioral issues later.
OP, I'll second that seven weeks is too young to be leaving mother or littermates. Where are you getting this pup from? You should ask them to keep the pup and
any littermates until they are older. Even 8-9 weeks would be better (a week for a puppy does allow for a lot of development/learning), but really, please try to aim for 10-12 if they are doing a decent job raising/taking care of the pups. This will benefit your dog in the long run.
Definitely, do not leave them together unsupervised. Get an expen, use a puppy proof room, or crate the pup. When you can be 100% confident the adult will not react or get aggressive to any of the pups' antics, then, and only then would I even consider it. Aside from potential hazards of leaving the adult with the pup, that plan will also make it very hard to house train your pup.
Other than that, two books that are very helpful to new puppy parents are The Puppy Primer by Pat McConnell and Before & After Getting your Puppy by Dr. Ian Dunbar.
Make sure you are prepped with all the puppy supplies, have figured out how to allot enough time throughout the day/night for it, and have a plan of attack for training before he arrives (again, those books will help).