A new addition to our household

We are expecting a new arrival to our household next week. This cutie is 7 weeks today and we get to bring him home next week. Just in time for my birthday! We'd been looking for a puppy off and on for the last couple of years, but because for one reason or another, it just didn't work out. Finally, we decided that we weren't going to get one unless it fell into our laps. Well....this one did. I got a call last Thursday asking if we were still interested in a puppy. This was a place where we had gone to over a year ago and the last puppy had sold just an hour before we showed up! After a lot of discussion with the family, we went and looked and no suprise, we fell in love. This guy was one of 8. 4 boys and 4 girls. When I held him, I knew he was right one for me. He nearly fell asleep in my arms. He's a mixed breed. 50% lab and 50% golden retriver. Now, the question is how will he do with our older dog. Or should the question be, how will the older dog do with the new puppy? Any suggestions!!