When me and my parents got Morgan at 8 weeks we decided to get another a week later- hence we got Dylan who was 16wks old (M came from a fantastic breeder here in Dorset, and she knew of a friend who wanted to home D as she'd decided not to run him on). We had, and still have, no problems. Morgan was top dog (bossy little b**gger

), and Dyl was (and still is) quite happy to play second fiddle - unless you have food, in which case Dyl will take your fingers off if you hold the food a little too long

Now we me and my OH have Henry who is 10mths and we acquired his cousin Katie who is now 22mths. We've had madam woo woo for four months and they get on really, really well. They play together, steal toys and chewy sticks from each other, we coudln't be happier. Henry loves his little playmate, and IMHO, I think if you have one dog, then two are not much harder, so long as they get on.
My advice would be that only you know how your little 'un would be around a puppy. I do agree that if you got another boy, then you may get problems if the pup tries to assert himself on your current baby.
Good luck in whatever you decide
