a month
Leave him at home while you walk the big dog and play with the puppy at home.
That's way too young for a puppy to leave his/her mother, they should be at least 8 weeks old before they leave their mother.
A six week old puppy can stay home alone about a day maybe 2 but they need to be watched almost all the time.
If small puppies 8 weeks old but larger dogs can sometimes leave at 6 weeks just make sure they have all their teeth and eating dry puppy food.
yes
You can leave home when your about 18-20 years old.
Puppies should be allowed to nurse with their mothers atleast until they are 6-8 weeks old. After 8 weeks they would be healthy enough to find themselves a new home.
it would need to be 8 weeks old to leave its mum
No, I do not believe that you can get a puppy that is 3 weeks old. As far as I know, the puppy of any breed has to be at least 6 weeks old in order to take it home. Sorry if this answer is disappointing, but the puppy has to stay with its mother for that long.
You are able to take your dog home when the puppy is about 8 weeks old.
6 weeks old if its eating puppy food if not 8 weeks old
At that age you can start him on adult dog food.